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在线学英语 体验请申请：www.englishvip.com/wenkxd.htm 洛基英语，中国在线英语教育领导品牌 综合题，请根据题目给出的内容，来回答下面给出的。Plastics are materials which are softened by heat and set into lasting from when shaped in a mold. Some are natural; some are semisynthetic, 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(固化) 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(坏名声) and suspicion on the slow road to . 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 funny. 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 plastic antiques comes as a shock to most people. How can a material that seems so essential in the twentieth century, and one that is so much associated with cheap disposable products, have a histroy 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 found very cheaply. 请根据上面给出的内容，来回答下面的单项选择题（下列每小题备选中，只有一个符合题意的正确答案。每小题0分，共5题。）16. 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 ：The development of Plastics as a Modern Material D ：How Plastics Are Material 请选择答案： A:B:C:D:17. Which of the following is necessary to create any type of plastics? A ：Carbon. B ：Oil. C ：Eggs. D ：Coal. 请选择答案： A:B:C:D:18. According to the author, for approximately how many years have plastics existed? A ：100 B ：120 C ：140 D ：160 请选择答案： A:B:C:D:19. What historical information does the second paragraph give about plastics? A ：They originated primarily as road-surfacing materials. B ：They have come into general use very gradually. C ：Their popularity was at its height at the time of the Industrial Revolution. D ：The earliest types were soft and did not last very long. 请选择答案： A:B:C:D:20. Why does the author mention antiques in the third paragraph? A ：Some plastic objects are now considered antiques. B ：Plastics replicas(复制品) of valuable antiques are relatively common. C ：Young collector prefer real antiques to plastic objects. D ：Dealers use inexpensive plastic parts to repair valuable antiques 请选择答案： A:B:C:D: “成千上万人疯狂下载。。。。。。 更多价值连城的绝密英语学习资料， 洛基内部秘密英语，技巧，策略 请在 网上 申请报名”