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单选题
We see lightning before we hear the thunder because sound travels more slowly than light is.
A
before we
B
because
C
more slowly
D
light is
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更多 “单选题We see lightning before we hear the thunder because sound travels more slowly than light is.A before weB becauseC more slowlyD light is” 相关考题
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29． When it thunders, we always see the light before we hear the sound．______ It’s becauseA． our eyes are in front of our earsB． our eyes are cleverer than our earsC． our eyes can see but our ears can-tD．light goes faster than sound
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You see the lightning _____ it happens, but you hear the thunder later.
A.in an instantB.on the instantC.for an instantD.the instant
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You see the lightening ____________ it happens, but you hear the thunder later.A、the instantB、for an instantC、on the instantD、in an instant
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资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.
People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.
People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
We should take good care of our eyes______.
A.even if we can see well
B.only when we cannot see perfectly
C.only when we realize how important our eyes are
D.only when we can see well
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It′ s a long time __________ I saw youlast.
--Yes, and what a pity! It will be a longtime __________ we see each other again.
A.since; before
B.when; since
C.before; when
D.before; since
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We moved to the front row（）we could hear and see better.A、so asB、so thatC、becauseD、such that
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翻译：I’d like to remind you that we have to withdraw our offer if we don ’ t hear from you by next Monday.
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单选题（）,we often hear only what we want to hear, rather than really listening to other people.A
TraditionallyB
AdditionallyC
ConditionallyD
Exceptionll
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单选题We moved to the front row（）we could hear and see better.A
so asB
so thatC
becauseD
such that
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填空题Because light travels (fast) ____ than sound, lightning is seen before thunder(雷) is heard.
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单选题From the passage we know people need newly produced atlases because ______.A
they can’t see the old ones clearlyB
they like to buy different onesC
something has changedD
something is missing
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