单项选择题

We need someone really（）who can organize the office and make it run smoothly.

A. executive
B. effective
C. essential
D. efficient

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单项选择题
At the meeting both sides exchanged their views on a wide（）of topics they were interested in.

A. collection
B. density
C. extent
D. range
单项选择题
Eating too much fat can（）heart disease and cause high blood pressure.

A. contribute to
B. refer to
C. attend to
D. devote to
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