单项选择题

You see the lightning __ it happens, but you hear the thunder later.

A. the instant
B. for an instant
C. on the instant
D. in an instant
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______ evidence that language-acquiring ability must be stimulated.
A. It being
B. It is
C. There is
D. There being
单项选择题
Not only ______ people to send words, music, and codes to any part of the world, it can also be used to communicate far into space.
A. enabled by radio B. radio enables
C. does radio enable
D. has radio enabled
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