17. A. how
B. when
C. why
D. where
答案:C 儿子想知道父亲那样做的原因。
18. A. him
B. her
C. it
D. them
答案:A 此处him指作者的儿子。
19. A. heard
B. said
C. tasted
D. felt
答案:D feel like表示“感觉像”。使这对老人感觉高兴是我们应做的事。
20. A. only
B. especially
C. even
D. exactly
答案:B especially通常表示有意识地把某人或某事物突出到一个特别与众不同的地位,意为“尤其是;特别是”,常和介词短语或从句连用。阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。 Number sense is not the ability to count. It is the ability to recognize a in number. Human beings are born with this ability. , experiments show that many animals are, too. For example, many birds have good number sense. If a nest has four eggs and you remove one, the bird will not . However, if you remove two, the bird leaves. This means that the bird knows the between two and three.
Another interesting experiment showed a bird's number sense. A man was trying to take a photo of a crow(乌鸦)that had a nest in a tower, but the crow always left when she saw him coming. The bird did not until the man left the tower. The man had an .He took another man with him to the tower. One man left and the other stayed, but they did not the bird. The crow stayed away until the second man left, too. The experiment was with three men and then with four men. But the crow did not return to the nest until all the men were .It was not until five men went into the tower and only four left that they were able to fool the crow.
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