单项选择题

Mercury orbits the Sun in 88 Earth days at an average speed of 48 kilometres per second, allowing it to overtake Earth every 116 Earth days.

A．precipitate
B．stimulate
C．overhaul
D．rotate
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单项选择题
The badly wounded soldiers take ______ for medical treatment over those only slightly hurt.
A．priority
B．measures
C．chance
D．responsibility
单项选择题
Western scholars generally recognize two main kinds of riddle: the descriptive riddle and the witty question.
A．shrewd
B．absurd
C．controversial
D．exhilarating
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