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 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 link together in the setting or curing process to form chains , 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 plastic 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, has 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 cheaply.
1. The word sympathetic in Paragraph 2 most probably means_______.
A. harmful B. agreeable
C. pitiful D. sorry
2. It can be concluded from this passage that_______.
A. plastics are synthetic materials
B. plastics won public acceptance 120 years ago
C. plastics are very harmful in modern life
D. plastics are cheap as antiques
3. Which of the following is essential to create any type of plastics?
A. Carbon. B. Eggs.
C. Oil. D. Coal.
4. Plastics that harden into permanent shapes are called_______.
A. chained B. thermoplastic
C. synthetic D. thermosetting
5. 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 Manufactured.
1. B 2. D 3. A 4. D 5. C
跟小小孩说英文 :Feeding the baby 喂宝宝
跟小小孩说英文:Eat it up 吃干净
英蕊乐园游历记全集:Story 04 这个男孩是谁
跟小小孩说英文:A new dress 新衣
学前英语口语学习教程:第八单元
跟小小孩说英文:In the fast food restaurant 在快餐店
跟小小孩说英文:Buying clothes 买衣服
跟小小孩说英文:Having snacks 吃点心
学前英语口语学习教程:第七单元
跟小小孩说英文:Dining 吃饭
学前英语口语学习教程:第三单元
英蕊乐园游历记全集:Story 10 你是谁?
跟小小孩说英文:Having night snacks 吃宵夜
跟小小孩说英文:At the dining table饭桌上
学前英语口语学习教程:第四单元
跟小小孩说英文:In the supermarket 在超市(一)
学前英语口语学习教程:第二单元
学前英语口语学习教程汇总
跟小小孩说英文:Don't go too far 不要走远
跟小小孩说英文:Snacks 点心
英蕊乐园游历记全集:Story 05 这是什么
跟小小孩说英文:In the supermarket 在超市(二)
跟小小孩说英文:In the supermarket 在超市(三)
跟小小孩说英文:Dining courtesy 吃饭礼节
跟小小孩说英文:Splitting a piece of chocolate 分巧克力
跟小小孩说英文:Dining on Dragon Boat Festival 端午节吃饭
英蕊乐园游历记全集:Story 03 我爱我的家
跟小小孩说英文:Having cotton candy 吃棉花糖
跟小小孩说英文:No toys today 今天不买玩具
英蕊乐园游历记全集:Story 01 你好
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