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单选题
The equator is（）.
A
the primary great circle of the Earth perpendicular to the axis
B
the line to which all celestial observations are reduced
C
the line from which a celestial body's altitude is measured
D
All of the above
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［A］ As more has become known of the many thousands of African plant species and their complex ecology, naming, classification, and mapping have also become more particular, stressing what was actually present rather than postulating about climatic potential.［B］ In regions of higher rainfall, such as eastern Africa, savanna vegetation is maintained by periodic fires. Consuming dry grass at the end of the rainy season, the fires burn back the forest vegetation, check the invasion of trees and shrubs, and stimulate new grass growth.［C］ Once, as with the scientific treatment of African soils, a much greater uniformity was attributed to the vegetation than would have been generally accepted in the same period for treatments of the lands of western Europe or the United States.［D］ The vegetational map of Africa and general vegetation groupings used here follow the White map and its extensive annotations.［E］ African vegetation zones are closely linked to climatic zones, with the same zones occurring both north and south of the equator in broadly similar patterns. As with climatic zones, differences in the amount and seasonal distribution of precipitation constitute the most important influence on the development of vegetation.［F］ Nevertheless, in broad terms, climate remains the dominant control over vegetation. Zonal belts of precipitation, reflection latitude and contrasting exposure to the Atlantic and Indian oceans and their currents, give some reality to related belts of vegetation.［G］ The span of human occupation in Africa is believed to exceed that of any other continent. All the resultant activities have tended, on balance, to reduce tree cover and increase grassland; but there has been considerable dispute among scholars concerning the natural versus human-caused development of most African grasslands at the regional level.
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(A Most Forgiving Ape) The author found the area very disturbing because the equator sun was beating down him mercilessly.()
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Spring tides occur______．A.when the moon is new or fullB.when the moon and sun have declination of the same nameC.only when the moon and sun are on the same sides of the earthD.at the beginning of spring when the sun is over the equator
考题
BThe word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning(旋转) of the earth. At the equator(赤道) day and night are sometimes the same length. They are each twelve hours long. The sun rises at 6 in the morning and sets at 6 in the evening. For six months the North Pole is tilted(倾斜) toward the sun. In those months the Northern Hemisphere(半球) gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than night. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.56. When the Western Hemisphere is having day, the Eastern Hemisphere is having ______.A.both day and night B.day C.neither day nor night D.night
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共用题干
The world has got rainforests which cover 7% of the earth's surface.They grow around the earth's equator in South America,Central America,Africa,Southeast Asia,and Australia. Rainforests are important.(46)______.These rainforests are wet and warm.They get more than two meters of rain each year,and temperatures are usually between 24℃and 27℃．(47)______. Each area has a different environment with different plants,trees and animals.(48)______.Every day a part of the rainforest,the same size as a football field,is destroyed because of human activities.(49)______,people cut down trees to make plantations to grow food,to get minerals or metals out of the ground or to build more and more houses.(50) ______.Cutting down trees must be prohibited and wild animals must be protected.If people break these rules,they must be arrested and severely punished._________（47）A:Therefore strict measures must be takenB:They give the earth oxygen,and are the home for half of the world's animals and plantsC:Because of a growing populationD:Unfortunately,these rainforests are in dangerE:Tropical rainforests are home to tribal peoples who rely on their surroundings for food,shelter,and medicinesF: They are divided into four different areas
考题
New Zealand is the first country in the world to get the new day because（）A、it is just east of the International Date LineB、it is just west of the International Date LineC、it is located halfway between the equator and the South PoleD、it is located in the Southern Pacific Ocean
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单选题If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.A
increasesB
remains the sameC
decreasesD
is unimportant and may be neglected
考题
单选题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.A
north magnetic poleB
south magnetic poleC
magnetic prime vertical meridianD
magnetic equator
考题
单选题A line on the Earth parallel to the equator is a（）.A
gnomonic curveB
small circleC
meridianD
great circle
考题
单选题A tropical wave is located 200 miles due west of your position，which is north of the equator. Where will the wave be in 24 hours? （）A
Farther away to the westB
Farther away to the eastC
In the same placeD
Closer and to the west
考题
单选题New Zealand is the first country in the world to get the new day because（）A
it is just east of the International Date LineB
it is just west of the International Date LineC
it is located halfway between the equator and the South PoleD
it is located in the Southern Pacific Ocean
考题
单选题The position if the IOR satellite in the INMARSAT system is（）above the equator.A
64.5EB
178EC
15.5WD
54W
考题
问答题Practice 2 Many matters, however, are less easily brought to the test of experience. If, like most of mankind, you have strong convictions on many such matters, there are ways in which you can make yourself aware of your own prejudices. If an opinion contrary to your own makes you angry, that is a sign that you subconsciously are aware of having no good reason for thinking as you do. If someone maintains that two and two are five, or that Iceland is on the equator you feel pity rather than anger, unless you know so little of arithmetic or geography that his opinion shakes your own contrary conviction. The most savage controversies are those about matters as to which there is no good evidence either way. So whenever you find yourself getting angry about difference of opinion, be on your guard; you will probably find, on examination that your belief is going beyond what the evidence justifies. For those who have enough psychological imagination, it is a good plan to imagine an argument with a person having a different opinion. This has one advantage, and only one, as compared with actual conversation with opponents: this one advantage is that the method is not subject to the same limitations of time and space. Mahatma Gandhi considered it unfortunate to have railways and steamboats and machinery; he would have liked to undo the whole of the industrial revolution. You may never have an opportunity of actually meeting anyone who holds his opinion, because in Western countries most people take the advantage of modern technology for granted. But if you want to make sure that you are right in agreeing with the prevailing opinion, you will find it a good plan to test the arguments that occur to you by considering what Gandhi might have said in refutation of them. I have sometimes been led actually to change my mind as a result of this kind of imaginary dialogue. Furthermore, I have frequently found myself growing more agreeable through realizing the possible reasonableness of a hypothetical opponent.
考题
单选题Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.A
always be nearer to the equatorB
always be nearer to the elevated poleC
be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern HemisphereD
be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions
考题
单选题A great circle track provides the maximum saving in distance on（）.A
easterly courses in high latitudesB
southerly courses in high latitudesC
westerly courses in low latitudesD
easterly courses in low latitudes that cross the equator
考题
单选题The greatest directive force is exerted on the magnetic compass when the（）.A
needles are nearly in line with the meridianB
vessel is near the magnetic polesC
variation is near zeroD
vessel is near the magnetic equator
考题
单选题Which information is found in the chart title（）.A
A rhumb line appears as a straight lineB
Distance is measured at the midlatitude of the track lineC
Meridians appear as curved lines converging toward the nearer poleD
Parallels，except the equator，appear as curved lines
考题
单选题A parallel of latitude other than the equator is a（）.A
great circleB
loxodromic curveC
small circleD
gnomonic curve
考题
单选题When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.A
Fathoms and metersB
Miles and kilometersC
Arc and degreesD
Degrees and minutes
考题
单选题（）is the distance east or west measured in degrees，minutes and seconds of arc on the equator between the prime meridian and the meridian passing through the place.A
LongitudeB
LatitudeC
HeightD
Bearing
考题
单选题In working out a local apparent noon sight for your latitude，you subtract the Ho from 90°. The 90°represents the angular distance from（）.A
the equator to the elevated poleB
your horizon to your zenithC
your zenith to the elevated poleD
the geographical position of the Sun to the elevated pole
考题
单选题In which voyage, between two points, is the rhumb line distance not approximately the same as the great circle distance?（）.A
The two points are in low latitudes in the same hemisphereB
The two points are in high latitudes in the same hemisphereC
The two points are near the equator, but in different hemispheresD
One point is near the equator, one point is in a high latitude, and both are near the 180th meridian
考题
单选题When crossing the magnetic equator the（）.A
Flinders bar should be invertedB
Heeling magnet should be invertedC
The quadrantal spheres should be rotated 180°D
Flinders bar should be moved to the opposite side of the binnacle
考题
单选题At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.A
the lines of force cross the equator on a 0°-180°alignmentB
the quadrantal error is 0°C
there is no vertical component of the Earth's magnetic fieldD
the intercardinal headings have less than 1°
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