单项选择题

There are so many mysteries waiting to be () that it seems that man is not wise enough.

A. opened
B. solved
C. unfastened
D. created

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问答题
1.你认为游戏对成年人也很重要吗 2.请举例说明你的观点。
单项选择题
51（）.

A. investigation
B. insight
C. consideration
D. prospect
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