-Mr. Li to Mary carefully when I entered the classroom this morning. -He is very patient he is young. A. talking; but B. was talking; though C. talks; though D. talked; however 题目和参考答案——青夏教育精英家教网—

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—Mr. Li ______ to Mary carefully when I entered the classroom this morning.

—He is very patient ______ he is young.

A. talking; but B. was talking; though

C. talks; though D. talked; however

【答案】B

【解析】考查动词的时态及连词的用法辨析。句意：——今天早上我进教室的时候，李老师在同玛丽仔细交谈。——虽然他很年轻，但他很有耐心。when引导的过去动作发生时，另一动作正在发生用过去进行时；though意为“虽然”用来引导让步状语从句

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Taking away a city's rubbish is a big job. Every day trucks come into a city to collect it. Most rubbish is made up of things we can't eat or use. If we kept these things we would soon have a mountain of rubbish.

In some cities the rubbish is collected and taken outside of 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 small pieces and sent into the sewage system. The sewage system takes away the used water from toilets, bathtubs and other places.

To keep mice and flies away, some earth is used to cover the newly dumped rubbish. Later, grass may be planted on the rubbish-filled land. Finally, a house or a school may be built there, and then you'd never know that this had once been an old rubbish dump.

In other cities the rubbish is burnt in special places. The fire burns everything but the metal. Sometimes the metal can be used again in factories where things are made of metal. The food parts of rubbish are put in special piles where they slowly change into something called humus, which looks like black earth. It is rich with the kinds of things that feed plants and help them grow.