单项选择题

Which of the following is a disadvantage of coal fires（）

A. It is rather expensive.
B. It cannot provide enough hot water.
C. It cannot be used for heating the living room.
D. It produces a lot of work and dust.

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单项选择题
When did President Clinton renew his threat to veto the measure（）

A. Seven days later.
B. A day after the Senate approved the plan.
C. Two days later.
D. Not mentioned.
单项选择题
Why does calling while driving increase risk of collisions（）

A. Drivers may forget to turn the steering wheel.
B. Driving may leave lanes.
C. Drivers may fail to stop the cars.
D. Drivers may distract their attention.
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