单项选择题

The prevailing wind is the wind direction most often observed during a given time period. Wind speed is the rate at which the air moves past a stationary object.

A．motionless
B．massive
C．flexible
D．noticeable
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单项选择题
Admiral Cervera knew he was being ordered to certain destruction but felt compelled to obey. He chose the morning of July 3 for a gallant escape attempt.
A．daring
B．futile
C．critical
D．fruitful
单项选择题
Education in Russia and the other new countries faces especially daunting obstacles because the struggling economies of these nations often provide insufficient funds for education.
A．stunning
B．discouraging
C．concerning
D．prevailing
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