单项选择题

After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and （）

A. runs away
B. charges for
C. falls off
D. merges into

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单项选择题

Being the manager of a large corporation, he has a great deal of ______ to deal with every day.

A. correspondents
B. correspondence
C. incidence
D. dependence

单项选择题

While modulation demodulation technology was being standardized for the most recent modems, several other peripheral standards were also being developed（）

A. auxiliary
B. notable
C. relevant
D. elemental

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