22 The sight, hearing and other senses of wild animals are much better than of a human. A that B those C which D what 题目和参考答案——青夏教育精英家教网—

For some people, the sight of a mouse can be reason to scream. For other mice, the same sight can be reason to sing.

Mice will probably 21 sing their way to any concert, but researchers in the United States have found 22 that mice do, 23 , sing.

Scientists already knew that mice make ultrasonic(超声波) sounds—noises that are too high-pitched(高音的) for people to hear 24 special equipment.

To find out whether mice put such sounds together in song-like 25 , the researchers recorded the sounds of 1 mice. Using computer 26 , they were able to separate the sounds into specific types of syllables(音节), and found the mice produced about 10 syllables per second.

The results showed that nearly all of the mice repeated sequences(顺序) of syllables in different patterns. That’s enough to meet the definition of what scientists 27 song. But not all scientists are 28 _ that what the mice are doing is 29 singing. To prove it, the researchers must show that there’s learning involved. And, they need to __ 30 why the mice sing.

21. A. almost B. even C. never D. usually

22. A. coincidence B. evidence C. guidance D. instance

23. A. at once B. by means C. for example D. in fact

24. A. during B. inside C. through D. without

25. A. fashions B. instructions C. patterns D. styles

26. A. access B. printer C. screen D. software

27. A. call B. hear C. sing D. write

28. A. accustomed B. convinced C. involved D. qualified

29. A. actually B. obviously C. simply D. unlikely

30. A. figure out B. get about C. run across D. talk over