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单选题
From the text we learn that the laser can ______.
A
cut a structure from a right position
B
design parts of a complex structure
C
measure the distance between planets
D
predict the movement of earth’s plates
参考答案
参考解析
解析：
推断题。从原文第三段第三句话“The laser beam has also been used to measure remote distances，for example，the precise distance from the Earth to the Moon．”可知，利用激光还可以测量更远的距离，比如说地球和月亮之间的精确距离。通过语义转换，激光可以用作测量星球之间距离的工具，故正确的答案为C。
推断题。从原文第三段第三句话“The laser beam has also been used to measure remote distances，for example，the precise distance from the Earth to the Moon．”可知，利用激光还可以测量更远的距离，比如说地球和月亮之间的精确距离。通过语义转换，激光可以用作测量星球之间距离的工具，故正确的答案为C。
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共用题干
Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.According to the passage,"weight"should be understood in the sense thatA:it is fixed if it is outside the earth's gravitational puliB:it decreases four times when it is 4,000 miles from the earth's centerC:it varies with the change of the gravitational attraction between two objectsD:things increase in amount as they are closer to the earth's surface
考题
共用题干
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考题
共用题干
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考题
共用题干
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考题
共用题干
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考题
单选题We can learn from the text that many newly married people ____.A
find it hard to pay for what they needB
have to learn to make their own furnitureC
take DIY courses run by the governmentD
seldom go to a department store to buy things
考题
填空题What we can learn from “Paper from Rag” is that you had better buy archival materials from specialist suppliers.____
考题
单选题From this text we learn that it is ______.A
harder to make a choice between public and private schoolsB
harder to go to private schools this year than beforeC
more difficult to go to public schools than to private schoolsD
as difficult to go to private schools this year as before
考题
单选题When we say that two objects have relative motion, we mean （）.A
the distance between them remains the sameB
the distance between them is changingC
the position between them is not changingD
their positions to the earth remain the same
考题
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It may be difficult for the young to learn new skills.B
Dogs play an important part in language and culture.C
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Dogs like the hottest days in summer very much.
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Rowling’s expectation is different from her parents’B
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all living things on the earth depend on the sun for their foodB
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only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
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单选题We can learn from the text mat Freud’s studies _____.A
are more ambiguous than any other scientific inventionB
have influenced other scientific inventionsC
cause SurrealismD
have infiltrated Surrealism
考题
单选题We can infer from the text that the writer’s father ______.A
had got the same illness beforeB
lived with her familyC
asked her to return to workD
felt lonely without her
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单选题The passage is mainly discussing _____.A
the difference between general history and art historyB
the making of art historyC
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the influence of artists on art history
考题
单选题From the text we can see that the writer seems ______.A
optimisticB
sensitiveC
gloomyD
scared
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