单项选择题

A. Goodbye.
B. Wish you success.
C. For sure.
D. That’s great.
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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. They are free. B. They are charged. C. They are expensive. D. They are cheap.
A. They are free. B. They are charged.
C. They are expensive. D. They are cheap.
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