单项选择题

A. On foot.
B. By bus.
C. By car.
D. By bike.
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Taking away a city’s rubbish is a big job. Every day trucks come into a city to (11) it. Most rubbish is made up of things we can’t eat or use. If we (12) these things, we would soon have a mountain of rubbish. In some cities the rubbish is collected and taken (13) the city to a dump. Often the city dump is placed where the ground is low or there is a big hole. The kitchen rubbish is broken into (14) and sent into the sewage system. The sewage system takes away the used water from toilets, bathtubs and (15) .
单项选择题
A. Never mind. B. Keep away from me.C. You’d better go and see a doctor. D. You need be more careful.
A. Never mind.
B. Keep away from me.
C. You’d better go and see a doctor.
D. You need be more careful.
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