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The Development of Rubber
Here is the story of rubber. From the earliest time it was common knowledge _______(51) the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid _______(52) milk came out, and that _______(53) this a sticky (粘的) mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any _______(54). The Peruvians made the_______(55) that it was very good for keeping out the wet. Then in the early 1800's, the Americans made use of it for the-first time. First they made overshoes to_______(56) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh _______(57), and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and_______(58) and inelastic (无弹性的) in the winter when it was cold. But the rubber we have today is soft and elastic (有弹性的),_______(59) very strong m even in the warmest summer and the coldest winter. This was made_______(60) by a man called Goodyear. After many_______(61), he found that nitric acid (硝酸) made the rubber much better, but it is not hard and strong enough. Then a strange thing took_______(62). A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulfur (硫磺) and put in the sun. Goodyear put this idea_______(63) the test, and saw that it did have more or less the desired effect though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the_______(64) to make rubber hard and strong is by heating it with sulfur. It took Goodyear four more years to find this method. When at last he did it, he had_______(65) at all. Everything of the smallest value had been used to get money, even his sons' school-books.

51. B 52. A 53. B 54. D 55. C 56. B 57. A 58. C 59. C 60. D 61. A 62. B 63. B 64. C 65. C
51. B to 意思是对于秘鲁人来说;
52. A like 像;alike 相似的,同样的;类似,相似;similar 相似的,类似的,相同的。 四个词属于近义词。like 作为系动词;
53. B from表示来源,意思是从这种牛奶状的物质我们得到了粘橡胶;
54. D form形状,句子的意思是可以做成各种形状; use使用; heat加热; pressure压力,压迫;
55. C discovery发现,发现物 指的是事物原本就存在后被别人发现; creation创造,创作; invention发明; recognition认出,承认不符合文意;
56. B keep保持,意思是保持脚的干燥; retain保留; hold把握; set放置;
57. A did 指代前面句子中的made引导的句子,这里的did是对made的一个代替 ; built ; retired; conducted;
58. C hard硬的; weak弱的; gentle温和的; strong强壮的;
59. C though但是。两个句子的意思具有转折意思; or或者; however然而; even甚至;
60. D make possible使. . . .可能 ; capable有能力; probable很可能的; practical实践的;
61. A experiment试验意思是经过多次的试验之后; checks核对; discoveries发现; works工作;
62. B take place 发生; form形式; shape形状; size号码;
63. B to, put the idea to the test 意思是把这个想法付诸实践; put on 穿上; put in 放进去; put with 容忍;
64. C way方法与后面的词语构成的意思是使橡胶变硬的方法是什么; system系统; style风格; direction方向。其他的词语的意思放在句子中不是非常合适;
65. C nothing 与 at all 常联系在一起使用; everything; anything; something 与其他的词语构成的短语不符合文意。

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