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    Study hard, _____ you can get good grades.

    A. or

    B. but

    C. while

    D. and

    D 【解析】 句意“努力学习，你就能取得好成绩”。本题考查连词辨析。A.否则；B.但是，表示转折；C.当……时候，引导时间状语从句；D.和，表示顺承。根据句意可知，表示顺承，故选D。
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    When we think of paper，we think of newspapers and books.But there are many other uses.Only half of the world's paper is used for books and newspapers.

    Paper is very good for keeping you warm.You have perhaps seen homeless men asleep on a large number of newspapers.In Finland，it is sometimes －40℃ in winter.The farmers wear paper boots(靴子) in the snow.Nothing could be warmer.

    Each year，more and more things are made of paper.We have had paper cups and plates for a long time.But now we hear that chairs，tables，and even beds can be made of paper.With paper boots and shoes，you can wear paper hats，paper dresses，and paper raincoats.When you have used them once，you throw them away and buy new ones.

    The latest use of paper seems to be paper houses.These are not small houses for children to play in，but real，big houses for people to live in.You can buy a house with three rooms for about 500 dollars.You can put it up by yourself in a few hours，and you can use it for about five years.

    1.Only half of the world's paper is used to ________.

    A. build houses

    B. help the homeless people

    C. make chairs，tables and beds

    D. print(印刷) newspapers and books

    2.The farmers in Finland wear paper boots in winter to ________.

    A. feel much better B. go for a walk

    C. keep their feet warm D. save a lot of money

    3.Long before we began to use paper to make chairs，tables and beds，________.

    A. we could buy paper boots and shoes in paper shops

    B. we had already had paper cups and plates

    C. we could wear paper hats and paper dresses

    D. we had no paper cups or paper plates

    4.After you use a paper raincoat，you may ________.

    A. use it for a long time B. sell it to others

    C. lend it to others D. throw it away

    5.The latest use of paper seems to be paper houses.These houses are ________.

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    B. made for children to play in or for homeless men to live in

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    (2018·山东临沂)What was discovered by accident? The answer is penicillin (青霉素). It kills germs. By killing germs, it saves lives. Suppose you are sick. You go to a doctor. She examines you. She says you have a “staph” infection (葡萄球菌感染). She gives you some medicine. You take it. The medicine knocks out the staph. Soon you are well. Before penicillin, this would not happen. Staph was almost sure death.

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