单项选择题

After several（）attempts to send the missile into space, the spacecraft was finally launched successfully.

A. abortive
B. difficult
C. experimental
D. preliminary

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单项选择题
The prices quoted above do not include any taxes and levies______upon the personnel by the government of the project-host country.
A. imposed
B. imported
C. improved
D. impressed
单项选择题
A 50-ft. wave travels at speeds（）20 m. p. h., and anyone who's too slow at the approach risks being smashed

A．in excess of
B．in the reach of
C．in exchange for
D．in relation to
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