The letters referred to in the first paragraph must have ______.
A. complained that carbon monoxide had affected their own ability to think
B. complained that carbon monoxide had affected other people's ability think
C. opposed the limiting of the use of cars
D. proposed the limiting of the use of cars
What kind of haircut did the man want
A fashionable style.
B. A basic trim.
C. A little off the top and more off the sides.
D. A permanent wav
设f(x)=x2(x-1)(x-2)，则f'(x)的零点个数为______．
A. 0
B. 1
C. 2
D. 3
What were the men doing according to the police
A. They were treating industrial waste.
B. They were tanking industrial waste.
C. They were tanking chemicals.
D. They were using a tank to mix chemicals.
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