单项选择题

The defense computers calculate ways to（）the enemy missiles.

A. spoil
B. harm
C. destroy
D. damage

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They set off by car and ______ the nearest town.
A. made for
B. made after
C. made out
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单项选择题
Everybody was required to keep the future plan in （）.

A. safety
B. secret
C. security
D. secrecy
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