单项选择题

Problems like this (). every day in the factory.

A. raise
B. rise
C. get
D. arise

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单项选择题
The business of doctors is to prevent and () disease.

A. kill
B. cure
C. wound
D. injure
单项选择题
The twins are so much () that it is difficult to tell one from the other.

A. similar
B. equal
C. like
D. alike
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