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
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单项选择题
The leaves of the eucalyptus tree can be used to make a potent antiseptic that kills harmful bacteria in cuts and scrapes.
A. natural
B. dangerous
C. rare
D. tropical
单项选择题
Ammonia, one of the earliest known nitrogen compounds, was originally produced by distilling organic materials.
A. masses
B. fabrics
C. substances
D. liquids
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