求英语高手帮做英语阅读. Plastics are materials which are softened by he

求英语高手帮做英语阅读. Plastics are materials which are softened by heat and set into lasting form when shaped in a mold. Some are natural; some are semi-synthetic, the result of chemical action on a natural substance; some are synthetic, built up from the constituents of oil or coal. All are based on the chemistry of carbon, with its capacity for forming chains. The molecules that compose them (monomers) link together in the setting or curing process to form chains (polymers), which give plastics their flexible strength.. Some plastics retain their ability to be softened and reshaped: like wax, they are thermoplastic. Others set permanently in the shapes they are given by heat and pressure; like eggs, they are thermosetting. From industrial beginnings in the nineteenth century, plastics have struggled through a hundred and twenty years of glory, failure, disrepute, and suspicion on the slow road to public acceptance. Now, at last, one can positively say that plastics are appreciated and enjoyed for what they are; that they make modern life richer, more comfortable and convenient, and also more fun. Plastics are warm materials, sympathetic to the human touch, and their transformation into things that come into contact with human beings is entirely appropriate. The fact that there are plastics antiques comes as a shock to most people. How can a material that seems so essentially twentieth-century, and one that is so much associated with cheap, disposable products, have a history at all? It is a young technology, and a great part of the fun of collecting plastics is that beautiful pieces of historical interest can still be found very cheap.
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1. Which of the following is the best title for the passage?
A . The Importance of Plastics in the Nineteenth Century
B . Why people Are Suspicious of Plastics
C . How Plastics Are Manufactured
D . The Development of Plastics as a Modern Material
2. Which of the following is necessary to create any type of plastics?
A . Carbon
B . Eggs
C . Oil
D . Coal
3. According to the author, for approximately how many years have plastics existed?
A . 100.
B . 120.
C . 140.
D . 160.
4. What historical information does the second paragraph give about plastics?
A . The earliest types were soft and did not last very long.
B . They have come into general use very gradually.
C . Their popularity was at its height at the time of the Industrial Revolution.
D . They originated primarily as road-surfacing materials.
5. Why does the author mention antiques in the third paragraph?
A . Some plastic objects are now considered antiques.
B . Plastic replicas of valuable antiques are relatively common.
C . Some young collectors prefer real antiques to plastic objects.
D . Dealers use inexpensive plastic parts to repair valuable antiques. tyy321 1年前他留下的回答 已收到1个回答

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D文章第一句即为主题句
A（All are based on the chemistry of carbon, with its capacity for forming chains）
B 文章中出现
B
B 文章倒数第二句话

1年前他留下的回答

4

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