单项选择题

One of the newer conservation projects undertaken by the state of Oklahoma involves flood prevention.

A. topics
B. programs
C. concerns
D. schools
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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
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
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