题目内容

Debris flew as the living-room fireplace and its chimney collapsed（）

A. small individual parts
B. completely good places
C. well preserved pieces
D. scattered broken pieces

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人耳的听觉频带是（）

A. 200-2000
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C. B．20-20000
D. Hz
E. C．20-2000
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A. sale contract
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A. General extraneous risks
B. War risks
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Counter sample can also be called（）

A. duplicate sample
B. sealed sample
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