单项选择题

The reason for their unusual behavior remains a puzzle.

A. fact
B. mystery
C. statement

D. game
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单项选择题
The object for each player in the game of chess is to trap the other player's king into a position from which escape is impossible.()

A. skill
B. aim
C. interest
D. difficulty
单项选择题
We derive knowledge mainly from books.()

A. deprive
B. obtain
C. descend
D. trace
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