You have often __1__ people talk about work. Perhaps you have __2__ your friends about how hard you worked to get something done. However, you may have done no work __3_ you think you worked hard.
A boy is pushing a big box very hard, but the box is __4__ heavy for him to move and he may __5__ to push against the box. __6__ the language of science, he has not done __7__ work. Can you think you are working when you are studying or talking?
In science, work is only done when a force(力) moves something that has weight through a distance(距离).
Work =" force" × distance moved.
__8_ you want to find out whether work is done, _9_ yourself, “Is a push or a pull moving something through a distance?” If your answer is __10_, then work is being done.
小题1: | A.asked | B.wanted | C.listened | D.heard |
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小题2: | A.said | B.told | C.talked | D.spoken |
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小题3: | A.though | B.so that | C.while | D.because |
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小题5: | A.be afraid | B.be sure | C.not like | D.like |
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小题8: | A.If | B.After | C.While | D.As soon as |
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小题9: | A.to ask | B.just ask | C.only think | D.to think |
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小题10: | A.“Right” | B.“Good” | C.“Well” | D.“Yes” |
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