单选题：The reason for their unusual behavior remains a puzzle.

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题目内容：
The reason for their unusual behavior remains a puzzle. A．fact
B．mystery
C．statement
D．game

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答案解析：

The machinery outside the calorimeters records everything

The machinery outside the calorimeters records everythingA．the volunteers do B．b

分类：综合类  题型：单选题
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I catch a cold now and then.

I catch a cold now and then.A．always B．occasionally C．constantly D．regularly

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设有定义：

设有定义： A．1234，3．142 B．123，3．142 C．1234，3．141 D．123，3．141

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peculiarly pointed chin is his most memorable facial charact

peculiarly pointed chin is his most memorable facial characteristic.A．mark B．fea

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Saudi Arabia is mentioned in the passage because it shows th

Saudi Arabia is mentioned in the passage because it shows thatA．the most importa

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