The Development of Rubber
Here is the story of rubber. From the earliest time it was __1__ common knowledge to the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid __2__ milk came out, and that __3__ this a sticky mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any __4__. The Peruvians made the discovery that it was very good for keeping out __5__. Then in the early 1800s, the Americans made use of it for the first time. First they made overshoes __6__ 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 __7__, and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and __8__ and inelastic in the winter when it was cold. But the rubber we have today is soft and elastic, though very strong---even in the __9__ summer and the coldest winter. This was made __10__ by a man called Goodyear. __11__ experiments, he found that nitric acid made the rubber much better, but it is not hard and strong enough. Then strange thing took place. A friend of __12__, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur and put in the sun. Goodyear put this idea __13__ 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 way to make rubber hard and strong is __14__ sulphur. It took Goodyear four more years to find this method. When at last he did it, he had nothing at all. Everything of the smallest value __15__ to get money, even his sons school-books.
1. A) a
B)
C) an
D) the
2. A) like
B) alike
C) in the form of
D) similar
3. A) with
B) from
C) up
D) of
4. A) thing
B) heat
C) press
D) form
5. A) wet weather
B) wet day
C) the wet
D) wet
6. A) to make
B) to keep
C) make
D) keep
7. A) did
B) had done
C) has done
D) was doing
8. A) cold
B) cool
C) hard
D) strong
9. A) warmer
B) warm
C) warmest
D) warm-up
10. A) impossible
B) possibly
C) possibility
D) possible
11. A) After many
B) With an
C) Having made much
D) With regard to
12. A) him
B) his
C) them
D) theirs
13. A) on
B) to
C) in
D) with
14. A) to heat with
B) to heat it by
C) by heating it with
D) by heating with
15. A) was used
B) had used
C) had been used
D) was being used
摄影师显微镜下揭开雾霾真面目
为何好老板经常不开心
The Amazing School Life 美好的学校生活
习主席在德国《法兰克福汇报》发表署名文章
1936年诺贝尔和平奖奖牌拍得116万美元
中情局审讯手段曝光
囧研究:脸长的男人智商高 卷福你赢了!
时尚准妈妈怀孕时该对待自己小腹
中国电视产业普遍缺乏创造性
看诺贝尔经济学奖得主如何谈投资
又迟到了?学习超级准时的人们的7个习惯
约会时如何优雅如厕
看电影学谈判:电影中的谈判技巧
世界十大奇葩驾驶法规
成功人士睡前必做的9件事
911接线员上班首日接自家急救电话 救父一命
阅读那是极好的:应该多读书的12个理由
出生即被遗弃快餐店 27年后女孩终觅得生母
哈佛商学院赶新潮试水在线教育
春夏来临 常喝柠檬水的11个好处
面试读心术:面试官不喜欢的六个回答
哈迷有福了!《哈利波特》外传将拍三部曲
吃多少盐才健康?
伦敦市长头发凌乱 小朋友赠梳子请他多梳头
老外爱逛北京菜市场
不能说的秘密:米歇尔访华花费知多少?
六种神奇抗衰老食物
揭秘导致加速衰老的5种原因
简约生活的乐趣
Child Models 童模
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |