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单选题
Since many insects have already become（）to DDT, scientists have to look for some new insecticide
A
active
B
resistant
C
tough
D
gradual
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更多 “单选题Since many insects have already become（）to DDT, scientists have to look for some new insecticideA activeB resistantC toughD gradual” 相关考题
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Medical scientists __________ finding a cure for cancer since 1960s.
A. have been working outB. have been workingC. have been working onD. have been building on
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A.comeB.are comingC.cameD.have come
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A. becameB. have becomeC. had becomeD. has become
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He said, “I ________ a lot of new words by the end of last year.”
A.had already learntB.have already learntC.would have already learntD.already learnt
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Many scientists have been probing psychological problems.A．solvingB．exploringC．settlingD．handling
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Since antiquity there have been many attempts, some quite ____, to explain how the cosmos came into being——they make imaginative to tell the story of the born of the cosmos.
A、familiarB、apparentC、fancifulD、logical
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Since tablets and smartphones have（ ）interface, many people believe that all home and business computers will eventually have this kind of interface too.A.CRT B.LED C.touch-screen D.large screen
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Scientists have many theories about how the universe ___ into being.A. cameB. was comingC. had comeD. would come
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共用题干
第二篇Natural MedicinesSince earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.They were successful long before the time of modern medicine.Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospi- tals.Yet injuries are treated.And diseases are often cured.How?By ancient methods.By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical, however.Through the centuries, tribal（部族的）medicine men experimented with plants. They found many use- ful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment.They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store.Yet many wide- ly-used medicines are from ancient sources,especially plants.Some experts say more than 25% of modern medicines come,in one way or another,from nature.Scientists have long known that nature is really a chemical factory.All living things contain chemicals that help them survive.So scientists' interest in traditional medicine is not new.But it has become an ur-gent concern.This is because the earth's supply of natural medicines may be dropping rapidly. Which of the following statements is NOT true?A:Modern medicines are now available all over the world. B:Many big and modern hospitals are expensive.C:Traditional medicines are neither mnysterious nor magical.D:Humans have used some kinds of medicines since earliest days.
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共用题干
Cloning（克隆）:Future Perlect?1 A clone is an exact copy of a plant or animal produced from any one cell.Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997,research into cloning has grown rapidly.In May 1998,scientists in Massachusetts managed to create two identical calves（牛犊）using cloning technology. A mouse has also been cloned successfully.But the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement:"We will have managed to clone a human being within the next two years."he told the world.2 Seed's announcement provoked a lot of media attention,most of it negative,In Europe, nineteen nations have already signed an agreement banning human cloning and in the U.S. the President announced:"We will be introducing a law to ban all human cloning and many states in the U. S. will have passed anti-cloning laws by the end of the year."3 Many researchers are not so negative about cloning.They are worried that laws banning human cloning will threaten important research.In March,The New England Journal of Medicine called any plan to ban research on cloning humans seriously mistaken.Many researchers also believe that in spite of attempts to ban it,human cloning will have become routine by 2010 because it is impossible to stop the progress of science.4 Is there reason to fear that cloning will lead to a nightmare world?The public has been bombarded（轰炸）with newspaper articles, television shows and films, as well as cartoons.Such information is often misleading,and makes people wonder what on earth the scientists will be doing next.5 Within the next five to ten years scientists will probably have found a way of cloning humans.It could be that pretty soon we will be able to choose the person that we want our child to look like,But how would it feel to be a clone among hundreds,the anti-cloners ask. Pretty cool, answer the pro-cloners（赞成克隆的人）.Within ten years scientists wil!probably have_______.A:the nucleus of a cellB:cloned human beingsC:a human being in two yearsD:a law to ban human cloningE:a report on human cloningF:heavy media coverage
考题
共用题干
Cloning（克隆）:Future Perlect?1 A clone is an exact copy of a plant or animal produced from any one cell.Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997,research into cloning has grown rapidly.In May 1998,scientists in Massachusetts managed to create two identical calves（牛犊）using cloning technology. A mouse has also been cloned successfully.But the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement:"We will have managed to clone a human being within the next two years."he told the world.2 Seed's announcement provoked a lot of media attention,most of it negative,In Europe, nineteen nations have already signed an agreement banning human cloning and in the U.S. the President announced:"We will be introducing a law to ban all human cloning and many states in the U. S. will have passed anti-cloning laws by the end of the year."3 Many researchers are not so negative about cloning.They are worried that laws banning human cloning will threaten important research.In March,The New England Journal of Medicine called any plan to ban research on cloning humans seriously mistaken.Many researchers also believe that in spite of attempts to ban it,human cloning will have become routine by 2010 because it is impossible to stop the progress of science.4 Is there reason to fear that cloning will lead to a nightmare world?The public has been bombarded（轰炸）with newspaper articles, television shows and films, as well as cartoons.Such information is often misleading,and makes people wonder what on earth the scientists will be doing next.5 Within the next five to ten years scientists will probably have found a way of cloning humans.It could be that pretty soon we will be able to choose the person that we want our child to look like,But how would it feel to be a clone among hundreds,the anti-cloners ask. Pretty cool, answer the pro-cloners（赞成克隆的人）.Richard Seed's announcement received_______.A:the nucleus of a cellB:cloned human beingsC:a human being in two yearsD:a law to ban human cloningE:a report on human cloningF:heavy media coverage
考题
Although interior design has existed since the beginning of architecture,its development into a specialized field is really quite recent.Interior designers have become important partly because of the many functions that might be（ ）in a single large building.A.consisted
B.contained
C.composed
D.comprised
考题
Since tablet computers and smart phones have（71）interface, many people believe that all home and business computers will eventually have this kind of interface too.A.CRT
B.LED
C.Touch-screen
D. Large screen
考题
Since many of the older, bigger-tusked animals have already been destroyed, what did thepoacher do?___________A.They gave up poaching
B.They killed more elephants to get the same quantity of ivory
C.To them, game is over
D.They realized it was illegal to slaughter elephants
考题
Since tablets and smartphones have（ ）interface,many people believe that all home and business computers will eventually have this kind of interface too.A.CRT
B.LED
C.touch-screen
D.large screen
考题
共用题干
Natural MedicinesSince earliest days,humans have used some kinds of medicines.We know this because hu-mans have survived .Ancient treatments for injury and disease were successful enough to keep hu-mans from dying out completely.They were successful long before the time of modern medicine.Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.Many parts of the world still do not have university-educated doctors.Nor do they have ex- pensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient meth- ods. By medicines that might seem mysterious, even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.Through the centuries, tribal（部落的）medicine men experimented with plants. They found many useful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.Experts say almost 80%of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment.They are used be-cause people trust them.In developed areas,few people think about the source of the medicines they buy in a store.Yet many widely-used medicines are from ancient sources,especially plants. Some experts say more than 25%of modern medicines come,in one way or another,from nature.Scientists have long known that nature is really a chemical factory.All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly. It is believed by scientists that traditional medicines______.A:cancureallkindsofdiseasesB: maycuresomeoftoday,smostseriousdiseasesC: arenolongerusefulformodernmenD: aretoocheaptoheuseful
考题
共用题干
What's Killing the BatsFirst it was bees.Now it is bats.Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country.Most of the bats affected are the common little brown bats(Myotis lucifugus,)but other species, such as the long-eared bat,the small-footed bat,the eastern pipistrelle,and the Indiana bat have also been affected. In some caves,more than 90 percent of the bat populations have died.One possibility is disease. A white fungus（真菌）known as fusarium has been found on the noses of both living and dead bats.However,scientists don't know if the fungus is the primary cause of death,a secondary cause of death,or not a cause at all,but the result of some other conditions.Another possible cause is a lack of food.For example,bats typically eat a large number of moths（蛾）,and in some states such as New York,the number of moths has been declining in recent years. if bats can't eat enough food,they starve to death.Still other scientists believe that global warming is to blame.Warmer temperatures in recent years have been waking up hibernating（冬眠）bats earlier than usual. If bats break their hiberna- lion at the wrong time,they might not find their expected food sources. The weather might also turn cold again and weaken or kill the bats.Scientists might not agree on the causes of the bat die-off, but they do agree on the conse- quences. Bats are an important predator of mosquitoes:a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops.If there aren't enough bats,damage will be great from the insects they eat. While bats live a long time for their size-the little brown bat can live for more than 30 years-a female bat has only one baby per year,so bat populations grow slowly. Many bat species in the United States are already protected or endangered.How can you help?Do not disturb sleeping or nesting bats.If you discover bats that seem to be sick or that are dead,contact your local Fish& Wildlife Department with the details.However, be careful not to touch the animals.A: diseases that kill batsB: insects that bats eatC: animals that have diseasesD: bat species that are starving to death
考题
共用题干
What's Killing the BatsFirst it was bees.Now it is bats.Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country.Most of the bats affected are the common little brown bats(Myotis lucifugus,)but other species, such as the long-eared bat,the small-footed bat,the eastern pipistrelle,and the Indiana bat have also been affected. In some caves,more than 90 percent of the bat populations have died.One possibility is disease. A white fungus（真菌）known as fusarium has been found on the noses of both living and dead bats.However,scientists don't know if the fungus is the primary cause of death,a secondary cause of death,or not a cause at all,but the result of some other conditions.Another possible cause is a lack of food.For example,bats typically eat a large number of moths（蛾）,and in some states such as New York,the number of moths has been declining in recent years. if bats can't eat enough food,they starve to death.Still other scientists believe that global warming is to blame.Warmer temperatures in recent years have been waking up hibernating（冬眠）bats earlier than usual. If bats break their hiberna- lion at the wrong time,they might not find their expected food sources. The weather might also turn cold again and weaken or kill the bats.Scientists might not agree on the causes of the bat die-off, but they do agree on the conse- quences. Bats are an important predator of mosquitoes:a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops.If there aren't enough bats,damage will be great from the insects they eat. While bats live a long time for their size-the little brown bat can live for more than 30 years-a female bat has only one baby per year,so bat populations grow slowly. Many bat species in the United States are already protected or endangered.How can you help?Do not disturb sleeping or nesting bats.If you discover bats that seem to be sick or that are dead,contact your local Fish& Wildlife Department with the details.However, be careful not to touch the animals. What is the main idea of this passage?A: All species of bats in North America are dying.B: Scientists already know the cause of the deaths of bats.C: The bat deaths are a serious problem.D: There are many possible causes of the deaths of bats.
考题
The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,
over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished
24?1985 and 1995．
Habitat destruction can be?25?or it can be subtle,occurring over a
26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as
30?as the clear-cutting of a rainforest．
31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．
第29题的答案是（ ）A.people
B.Species
C.plants
D.insects
考题
The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,
over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished
24?1985 and 1995．
Habitat destruction can be?25?or it can be subtle,occurring over a
26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as
30?as the clear-cutting of a rainforest．
31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．
第22题的答案是（ ）A.At
B.Before
C.After
D.Since
考题
单选题The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the following, if true, gives the strongest support to the scientists’ claim?A
DDT was not generally in use in areas devoted to heavy industry.B
In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.C
Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.D
Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.E
Other birds of prey, such as the osprey, the bald eagle, and the brown pelican, are found in the same areas as is the peregrine falcon.
考题
单选题How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?A
whenB
beforeC
sinceD
until
考题
问答题Scientific and technological advances have improved our daily lives. However, in many fields scientists cannot solve the problems they have created themselves. Do you agree or disagree with this opinion? Give your reasons. Write a composition of about 400 words on this topic.
考题
单选题It can be learned that Methuselah _____.A
is an ancient tree about 2000 years oldB
is grown from a seed about 2000 years oldC
had already become extinct 2000 years agoD
has been the food source since 2000 years ago
考题
单选题Since the beginning of this century, more and more scientists have become interested in the way how the human brain works.A
Since the beginningB
have becomeC
inD
the way how
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