单项选择题

In order to be a good scientist, ________.

A．mathematics is urgent
B．one should have the mathematics
C．one must understand mathematics
D．mathematics is important to be understood
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单项选择题
Because of the bad food he had eaten, his stomach began to ________.
A．pain
B．be hurt
C．ache
D．harm
单项选择题
Mrs. Nancy was wakened midnight by the ringing of the phone several hours after the ship that her husband was on had been ________.
A．fired
B．decayed
C．wrecked
D．collapsed
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