单项选择题

Careful testing is necessary before any more experiments can continue with the exploring submarine.

A．needful
B．in need of
C．necessity
D．of necessity
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单项选择题
No matter how hard you try, you can find no parallel existing between them.
A．analogy
B．angel
C．ambition
D．antique
单项选择题
It takes the most cool-headed and good-tempered of drivers to resist the temptation to make reprisals when subjected to uncivilized behavior.
A．challenge
B．laugh
C．revenge
D．appreciate
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