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问题 单项选择题

①耳膜振动
②听骨传递
③物体振荡
④听到声音
⑤机械能转换成神经电冲动( )

A．3—5—1—2—4

B．3—1—2—5—4

C．3—1—5—2—4

D．3—2—1—5—4

答案

参考答案：B

解析： 本题考查的是人耳听声的过程。只有物体发生振动引起人的耳膜振动，再由听骨进行传递，将机械能转化为神经电冲动，人耳才能听到声音，因此，人耳听声的过程应为3—1—2—5—4。观察各项，只有B项符合。故正确答案是B。

名词解释

风险清单法
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单项选择题

The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially (1) the Depression of the 1930’s, the United States experienced a (2) birth rate. Then with the prosperity (3) on by the Second World War and the economic boom that followed it, young people married and (4) households earlier and began to (5) larger families than had their (6) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (7) economics was probably the most important (8) , it is not the only explanation for the baby boom. The increased value placed (9) the idea of the family also helps to (10) this rise in birth rates. The baby boomers began streaming (11) the first grade by the mid-1940’s and became a (12) by 1950. The public school system suddenly found itself (13) The wartime economy meant that few new schools were buih between 1940 and 1945. (14) , large numbers of teachers left their profession during that period for better-paying jobs elsewhere.

(15) , in the 1950’s, the baby boom hit an antiquated and inadequate school system. Consequently, the custodial rhetoric of the 1930’s no longer made (16) ; keeping youths ages sixteen and older out of the labor market by keeping them in school could no longer be a high (17) for an institution unable to find space and staff to teach younger children. With the baby boom, the focus of educators (18) turned toward the lower grades and back to basic academic skills and (19) . The system no longer had much (20) in offering nontraditional, new, and extra services to older youths.

16（）

A.sense

B.meaning

C.sensible

D.meaningful
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