单项选择题

What do you think the woman will do

A．Go to see Bob.
B．Ring up Bob.
C．Wait for Bob to be back.
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单项选择题
Which is not said that can pollute our air
A．Smoke from our homes.
B．Smoke from buses.
C．Smoke from trucks.
单项选择题
Environmental engineers’ work is to
A．design new kind of cars, buses and trucks that will not pollute the air
B．protect the environment
C．produce cars that will not pollute the air
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