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
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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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in。
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