问题 单项选择题

指出一般不引起左心室增大疾病()

A.高血压性心脏病

B.主动脉瓣关闭不全及狭窄

C.肺源性心脏病

D.风湿性心脏病二尖瓣关闭不全

E.先天性心脏病-动脉导管未闭

答案

参考答案:C

选择题
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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