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

All mammals have hair, but not always evident.()

A. but it is not
B. but it is
C. but they are not
D. but they are

单项选择题

The word wrath in The Grapes of Wrath by the Nobel prize winner John Steinbeck probably means:

A. great anger

B. large crowds
C. hard labor

D. sudden storms

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