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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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
单项选择题
The new washing machines are()at the rate of fifty a day.

A. turned up
B. turned down
C. turned out
D. turned in
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