C. catch

　　D. kill 10. A. reported

　　B. repeated

　　C. designed

　　D. approved But the crow did not return to the nest until all the men were 11 . It was not until five men went into the tower and only four left that they were 12

　　able to fool the crow.

　　How good his the human’s number sense? It’s not very good.

　　11. A. confused

　　B. gone

　　C. tired

　　D. drunk 12. A. gradually

　　B. luckily

　　C. strangely

　　D. finally For example, babies about fourteen months old almost always notice if something is taken away from a

　　13

　　group. But when the number goes beyond three or four, the children are

　　14

　　fooled. It seems that number sense is something we have in common with many animals in this world and that our human

　　15

　　is not much better than a crow’s.

　　13. A. single

　　B. small

　　C. local

　　D. new 14. A. seldom

　　B. temporarily

　　C. merely

　　D. often 15. A. sight

　　B. nature

　　C. ability

　　D. belief

　　本文在说明什么叫数字感之后, 首先指出动物同人类一样也有数字感, 然后用experiments show…Another interesting experiment showed…两个实验分别说明鸟能注意到少于4的数字变化和乌鸦能知道少于5的数字变化, 由此证明动物也有数字感；接着用14个月的婴儿分不清超过3或4的数字变化, 说明人的数字感并不比乌鸦强多少。(文章结构：观点/实验结果→举例证明/实验过程→总结) 1. C

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