网友您好， 请在下方输入框内输入要搜索的题目：

题目内容 （请给出正确答案）
Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.
Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.
Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them.
Twenty years ago,the gray whale was listed as an endangered species.
Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.
Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.
65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population．

One reason it is difficult to know why the whales are dying is that__.

A.the whales travel such a long distance
B.there are more whales than there used to be
C.the whale bodies are too old to study by the time they are found
D.the whales are endangered

参考答案

参考解析
解析：由倒数第二段可知。
更多 “Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico. Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying. Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them. Twenty years ago,the gray whale was listed as an endangered species. Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino. Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death. 65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population． One reason it is difficult to know why the whales are dying is that__.A.the whales travel such a long distance B.there are more whales than there used to be C.the whale bodies are too old to study by the time they are found D.the whales are endangered” 相关考题
考题 The writer and teacher () (write) a new book every year.
查看答案
考题 Because of the strong sun, Mrs. White’s new dinning-room curtains ______ from dark blue to gray within a year.A、disappearedB、fadedC、paledD、grew
查看答案
考题 Sea birds ______ penguins live on the Antarctic Peninsula, because the weather isn't quite so terrible there.A、likeB、dislikeC、likelyD、unlikely
查看答案
考题 Admiralty Notices to Mariners are published ______.A.every dayB.every weekC.every monthD.every year
查看答案
考题 What natural feature is responsible for the rather even climate found on the Florida peninsula throughout the year?A.Strong masses of continental airB.The Gulf StreamC.The Bermuda highD.The cool waters of the Sargasso sea
查看答案
考题 共用题干 第一篇California一A Land of Variety and ContrastCalifornia is a land of variety and contrast. Almost every type of physical land feature,sort of arctic ice fields and tropical jungles can be found within its borders.Sharply contrasting types of land often lie very close to one another. People living in Bakersfield,for instance,can visit the Pacific Ocean and the coastal plain,the fertile San Joaquin Valley,the arid Mojave Desert,and the high Sierra Nevada,all within a radius of about 100 miles. In other areas it is possible to go snow skiing in the morning and surfing in the evening of the same day,without having to travel long distance.Contrast abounds in California. The highest point in the United States(outside Alaska)is in California,and so is the lowest point(including Alaska).Mount Whitney,14,494 feet above sea level,is separated from Death Valley,282 feet below sea level,by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles.California has deep,clear mountain lakes like Lake Tahoe,the deepest in the country,but it also has shallow,salty desert lakes.It has Lake Tulainyo,12,020 feet above sea level,and the lowest lake in the country,the Salton Sea,236 feet below sea level. Some of its lakes,like Owens Lake in Death Valley,are not lakes at all:they are dried up lake beds.In addition to mountains,lakes,valleys,deserts,and plateaus,California has its Pacific coastline,stretching longer than the coastlines of Oregon and Washington combined.How far away is Death Valley from Mount Whitney?A:About 3 miles.B:Only 100 miles.C:282 feet.D:14,494 feet.
查看答案
考题 共用题干 第一篇California一A Land of Variety and ContrastCalifornia is a land of variety and contrast. Almost every type of physical land feature,sort of arctic ice fields and tropical jungles can be found within its borders.Sharply contrasting types of land often lie very close to one another. People living in Bakersfield,for instance,can visit the Pacific Ocean and the coastal plain,the fertile San Joaquin Valley,the arid Mojave Desert,and the high Sierra Nevada,all within a radius of about 100 miles. In other areas it is possible to go snow skiing in the morning and surfing in the evening of the same day,without having to travel long distance.Contrast abounds in California. The highest point in the United States(outside Alaska)is in California,and so is the lowest point(including Alaska).Mount Whitney,14,494 feet above sea level,is separated from Death Valley,282 feet below sea level,by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles.California has deep,clear mountain lakes like Lake Tahoe,the deepest in the country,but it also has shallow,salty desert lakes.It has Lake Tulainyo,12,020 feet above sea level,and the lowest lake in the country,the Salton Sea,236 feet below sea level. Some of its lakes,like Owens Lake in Death Valley,are not lakes at all:they are dried up lake beds.In addition to mountains,lakes,valleys,deserts,and plateaus,California has its Pacific coastline,stretching longer than the coastlines of Oregon and Washington combined.Which of、 the following is the lowest point in the United States?A:Lake Tulainyo.B:Mojave desert.C:Death Valley.D:The Salton Sea.
查看答案
考题 共用题干 第一篇California一A Land of Variety and ContrastCalifornia is a land of variety and contrast. Almost every type of physical land feature,sort of arctic ice fields and tropical jungles can be found within its borders.Sharply contrasting types of land often lie very close to one another. People living in Bakersfield,for instance,can visit the Pacific Ocean and the coastal plain,the fertile San Joaquin Valley,the arid Mojave Desert,and the high Sierra Nevada,all within a radius of about 100 miles. In other areas it is possible to go snow skiing in the morning and surfing in the evening of the same day,without having to travel long distance.Contrast abounds in California. The highest point in the United States(outside Alaska)is in California,and so is the lowest point(including Alaska).Mount Whitney,14,494 feet above sea level,is separated from Death Valley,282 feet below sea level,by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles.California has deep,clear mountain lakes like Lake Tahoe,the deepest in the country,but it also has shallow,salty desert lakes.It has Lake Tulainyo,12,020 feet above sea level,and the lowest lake in the country,the Salton Sea,236 feet below sea level. Some of its lakes,like Owens Lake in Death Valley,are not lakes at all:they are dried up lake beds.In addition to mountains,lakes,valleys,deserts,and plateaus,California has its Pacific coastline,stretching longer than the coastlines of Oregon and Washington combined.Where is the highest point in the United States located?A:Lake Tahoe.B:Sierra Nevada.C:Mount Whitney.D:Alaska.
查看答案
考题 Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico. Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying. Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them. Twenty years ago,the gray whale was listed as an endangered species. Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino. Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death. 65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population． Which of the following is NOT a possible reason for whales dying?A.Pneumoni B.Brain infectio C.Over-populatio D.Over-eatin
查看答案
考题 Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico. Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying. Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them. Twenty years ago,the gray whale was listed as an endangered species. Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino. Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death. 65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population． Why might the increasing number of whales cause problems with their health?A.There's not enough room for them in Alask B.There may not be enough food for them in Alask C.They get pushed ashor D.There are more whales to spread diseas
查看答案
考题 Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico. Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying. Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them. Twenty years ago,the gray whale was listed as an endangered species. Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino. Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death. 65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population． About how many more whales have been sighted in the San Francisco Bay this year compared to last year?A.Twice as man B.Three times as man C.Half as man D.About the sam
查看答案
考题 共用题干 What We Take From and Give to the SeaAs long as we have been on earth,we have used the sea around us.We take from the ocean,and we give to it.We take fishes from the ocean-millions of kilograms of fish,every year,to________(51)millions of people.We even_______(52)their bones for fertilizer.We take minerals from the ocean.One way to get salt is to_______(53)seawater in shallow basin and leave it until it evaporates（蒸发）.Along with salt,other minerals are left_______(54)evaporation.Much gold and silver drift dissolved in the waters of the sea,too.But the sea does not give them_______(55)by simple evaporation.________(56)gifts from the sea are pearls , sponges（海绵）and seaweed.Pearls________(57)jewelry.Natural sponges become cleaning aids.Seaweed becomes______(58)of many kinds一even candy,and ice cream一as well as medicine.Believe it or not,fresh water is another_______(59)from the sea.We cannot drink ocean water.Some of its contents may______(60)illness.But ocean water becomes fresh water when the salts are ________(61).In the future,we will find ourselves．________(62)more and more onfresh water from the sea.The sea_______(63)us food,fertilizer,minerals,water,and other gifts.What do we give the sea?Garbage.We pollute the ocean_______(64)we use it as a garbage dump.Huge as it is,the ocean cannot hold all the water that we pour into it.________(65)garbage into the ocean is killing off sea life.Yet as the world population grows,we may need the sea and its gifts more than ever._________65A:Reducing B:Collecting C:Removing D:Casting
查看答案
考题 共用题干 What We Take From and Give to the SeaAs long as we have been on earth,we have used the sea around us.We take things from the ocean,and we give to it.We take fishes from the ocean-millions of kilograms of fish,every year,to feed millions of people.______(46)We take minerals from the ocean.One way to get salt is to place seawater in a shallow basin and leave it until it evaporates.______(47) Much gold and silver drift dissolved in the waters of the sea,too.But the sea does not give them up by simple evaporation.Other gifts from the sea are pearls,sponges and seaweed.Pearls become jewelry.______(48)Seaweed becomes food of many kinds-even candy,and ice cream-as well as medicine.Believe it or not,fresh water is another gift from the sea.We cannot drink ocean water.______(49)But ocean water becomes fresh water when the salts are removed.In the future,we will find ourselves depending more and more on fresh water from the sea.The sea gives us food,fertilizer,minerals,water,and other gifts .What do we give the sea?Garbage.______(50)Huge as it is,the ocean cannot hold all the water we pour into it. Dumping garbage into the ocean is killing off sea life.Yet as the world population grows,we may need the sea and its gifts more than ever.We are finally learning that if we destroy our sea,we might also destroy ourselves.Hopeful-ly,it is not too late.______(48)A: Natural sponges become cleaning aids.B: We pollute the ocean when we use it as a garbage dump.C: The area of the sea is becoming smaller and smaller.D: Along with salt,other minerals are left after evaporation.E: We even use their bones for fertilizer.F: Some of its contents may cause illness.
查看答案
考题 共用题干 第三篇AlaskaIn 1959 Americans welcomed Alaska into the Union as the 49th state,symbolizing a change of attitude from that held in 1867, when the peninsula（半岛）was purchased from Russia.Then, most Americans had little interest in 1,500,000 square kilometers"of icebergs and polar bears"-beyond Canada's western borders,far from the settled areas of the United States.In those sections of the state which lie above the Arctic Circle,Alaska still is a land of icebergs and polar bears.Ice masses lie buried in the earth.From early May until early August,the midnight sun never :ts on this flat,treeless region,but the sun cannot melt the icy soil more than two-thirds of a meter down.Alaska is America's largest state,but only about 325,000 people live there.According to estimates, 800，000 hectares of its land area are fit for plowing but only about 640,000 hectares are being cultivated?Arctic Alaska has been the home of Eskimos for countless centuries.It is believed that the Eskimos moved there from Mongolia or Siberia,probably crossing Bering Strait,named for Vitus Bering,the Danish ea captain who discovered Alaska on his voyage for Russia in 1741.The Eskimos are the state's earliest known inhabitants.Russian fur traders established settlements but,by the time Alaska was sold to the United States,most of the traders had departed.In 1896 gold was discovered near the Klondike River in Canada just across the Alaskan border.Thousands of Americans rushed to the region on their way to Klondike;some never returned.Alaska was ,ever completely cut off again,although even today transportation is a major problem.There are only two motor routes from the US mainland,and within the state,every town has its own airfield.Planes fly passengers,mail and freight to the most distant villages.The gold that changed life so suddenly for Alaska was soon ended,and although many stories about fining camps have become part of American literature,the gold from Alaskan earth contributed less to ,economic progress than the fish from Alaskan waters.The fish?caught in a single year range in value from $80 million to $90 million.Fur一bearing animals are plentiful in the forests and streams,and valuable fur seals inhabit the waters.After fishing,the state's chief industry is lumber and the production of wood pulp（纸浆）.In recent years,Alaska's single most important resource has become oil.The state also has large deposits of coal,copper,gold and other minerals.Alaska is an American state that________.A:locates within the Arctic CircleB:was known by Americans before 1867C:lies to the east of CanadaD:was once owned by Russia
查看答案
考题 共用题干 第三篇AlaskaIn 1959 Americans welcomed Alaska into the Union as the 49th state,symbolizing a change of attitude from that held in 1867, when the peninsula（半岛）was purchased from Russia.Then, most Americans had little interest in 1,500,000 square kilometers"of icebergs and polar bears"-beyond Canada's western borders,far from the settled areas of the United States.In those sections of the state which lie above the Arctic Circle,Alaska still is a land of icebergs and polar bears.Ice masses lie buried in the earth.From early May until early August,the midnight sun never :ts on this flat,treeless region,but the sun cannot melt the icy soil more than two-thirds of a meter down.Alaska is America's largest state,but only about 325,000 people live there.According to estimates, 800，000 hectares of its land area are fit for plowing but only about 640,000 hectares are being cultivated?Arctic Alaska has been the home of Eskimos for countless centuries.It is believed that the Eskimos moved there from Mongolia or Siberia,probably crossing Bering Strait,named for Vitus Bering,the Danish ea captain who discovered Alaska on his voyage for Russia in 1741.The Eskimos are the state's earliest known inhabitants.Russian fur traders established settlements but,by the time Alaska was sold to the United States,most of the traders had departed.In 1896 gold was discovered near the Klondike River in Canada just across the Alaskan border.Thousands of Americans rushed to the region on their way to Klondike;some never returned.Alaska was ,ever completely cut off again,although even today transportation is a major problem.There are only two motor routes from the US mainland,and within the state,every town has its own airfield.Planes fly passengers,mail and freight to the most distant villages.The gold that changed life so suddenly for Alaska was soon ended,and although many stories about fining camps have become part of American literature,the gold from Alaskan earth contributed less to ,economic progress than the fish from Alaskan waters.The fish?caught in a single year range in value from $80 million to $90 million.Fur一bearing animals are plentiful in the forests and streams,and valuable fur seals inhabit the waters.After fishing,the state's chief industry is lumber and the production of wood pulp（纸浆）.In recent years,Alaska's single most important resource has become oil.The state also has large deposits of coal,copper,gold and other minerals.What is true about the Eskimos?A:They are the natives of Alaska.B:They moved to Alaska from Denmark.C:They had a long fight with the Russian traders?D:They discovered gold near the Klondike River.
查看答案
考题 Wire rope should be greased （）when not in use.A、every half a monthB、every month or twoC、every half a yearD、every year
查看答案
考题 You need to design a migration strategy to migrate public folders from the existing Exchange Server 5.5 environment to the Exchange Server 2003 environment. What should you do？（）A、Install and configure the Exchange utility. Use the utility to migrate and import all calendar information into each new mailboxB、Install and configure the InterOrg Replication Utility. Use the utility to migrate public folder information from Exchange Server 5.5 to Exchange Server 2003C、Install and configure a public folder connection agreement. Use this agreement to migrate the public folder information from Exchange Server 5.5 to Exchange Server 2003D、Run the pfmigrate command to migrate the public folder information from Exchange Server 5.5 to Exchange Server 2003
查看答案
考题 单选题What natural feature is responsible for the rather even climate found on the Florida peninsula throughout the year? （）A Strong masses of continental airB The Gulf StreamC The Bermuda highD The cool waters of the Sargasso sea
查看答案
考题 单选题The way in which the mighty blue whale and the other baleen whales—the finback, gray, humpback, and right whales—eats was discovered by careful observation by biologlogists.A eats was discovered byB eat was discovered throughC eats were discovered by means ofD eat were discovered byE eat was discovered resulting from
查看答案
考题 单选题Releasing oil from the sea anchor of a lifeboat may（）.A keep the propeller from being fouledB increase propeller speedC help calm the waves in the vicinity of the craftD increase the holding power of the sea anchor
查看答案
考题 单选题Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.A Alaska CurrentB Subarctic CurrentC Kuroshio CurrentD Oyashio Current
查看答案
考题 单选题According to the contract, the salary of the employee _____.A is paid weeklyB is adjusted every quarterC is re-examined from year to yearD is fixed for the whole contract period
查看答案
考题 单选题The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.A mean high waterB mean low waterC half-tide levelD mean sea level
查看答案
考题 单选题According to the international regulations concerning the prevention of pollution of sea areas from ships, the disposal into the sea of all plastics is （）.A welcomeB admitted in some special sea areasC prohibitedD acceptable
查看答案
考题 单选题Light Lists for coastal waters are（）.A published every year and require no correctionsB published every second year and must be correctedC published every five years and require no correctionD accurate thru NM number on title page and must be corrected
查看答案
考题 问答题Practice 10　　Glaciers in Antarctica are melting faster and across a much wider area than previously thought, a development that threatens to raise sea levels worldwide and force millions of people to flee low-lying areas. Researchers once believed that the melting was limited to the Antarctic Peninsula, a narrow tongue of land pointing toward South America. But satellite data and automated weather stations now indicate it is more widespread. The melting also extends all the way down to what is called west Antarctica. By the end of the century, the accelerated melting could cause sea levels to climb by 3 to 5 feet-levels substantially higher than predicted by a major scientific group just two years ago. Making matters worse, the ice shelves that hold the glaciers back from the sea are also weakening.　　For years, the continent at the bottom of the world seemed to be the only place on the planet not experiencing climate change. Previous research indicated that temperatures across much of Antarctica were staying the same or slightly cooling. The big surprise was exactly how much glaciers are melting in western Antarctica, a vast land mass on the Pacific Ocean side of the continent that is next to the South Pole and includes the Antarctic Peninsula. The glaciers are slipping into the sea faster because the floating ice shelf that would normally stop them—usually 650 t0980 feet thick—is melting. And the glaciers' discharge is making a significant contribution to increasing sea levels.　　Together, all the glaciers in west Antarctica are losing a total of around 114 billion tons per year because the melting is much greater than the new snowfall. That's equivalent to the current mass loss from the whole of the Greenland ice sheet, New research found that melting glaciers will add at least 7 inches to the world's sea level—and that's if carbon dioxide pollution is quickly capped and then reduced.
查看答案
考题 单选题I suppose that when I come back from sea in one year’s time all these old houses（）down.A will have been pulledB will be pullingC will have pulledD will be pulled
查看答案
热门标签
最新试卷