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【单选题】
正常人耳对声音频率的最敏感范围是( )(2006年)
A.
20~2000Hz
B.
100~6000Hz
C.
1000~3000Hz
D.
1000~10000Hz
E.
5000~20000Hz
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A.
质变的基础上会发生量变
B.
量的积累才会发生质变
C.
质变可能代替量变
D.
量变可以代替质变
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A.
顶层
B.
中间层
C.
二层
D.
首层
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A.
curious
B.
anxious
C.
particular
D.
cared
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A.
he had not cared about having a criminal record
B.
he had been out of work
C.
he had not cared about his son
D.
he had had witnesses to support him
【单选题】清代大文豪金圣叹曾经评曰:“十八路诸侯不能杀董卓,而一( )足以杀之。”
A.
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B.
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C.
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D.
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A.
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B.
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【单选题】In general, the ancient Romans were a practical people. They cared less about philosophy anti pure mathematics than did the Greeks. The Romans were the best of the ancient engineers anti architects. T...
A.
they could use their knowledge in their constructions
B.
they learned geometry and trigonometry very well
C.
they paid no attention to philosophy and pure mathematics
D.
they could became engineers and architects
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