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With his attention________on the shops along the roadside，he knocked an old man down while riding to school.
A concentrating B．concentrated C．to concentrate D．concentrates
答案 B
解析 考查词组，故选B项。
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As a result of careless washing，the jacket＿＿to a child's size．
A)compressed? B)shrank? C)dropped? D)decreased
查看习题详情和答案>>A land free from destruction , in addition to wealth , natural resources , and labor supply-all these were important 1 in helping England to become the center for the Industrial Revolution . 2 they were not enough . Something 3 was needed to start the industrial process(进程) . That “something special ” was men— 4 individuals who could invent machines , find new 5 of power , and establish business organizations to reshape society .
The men who 6 the machines of Industrial Revolution 7 from many backgrounds and many occupations . Many of them were 8 inventors than scientists . A man who is a 9 scientist is primarily interested in doing his research 10 . He is not necessarily working 11 that his findings can be used .
An inventor or anyone interested in applied science is 12 trying to make something that has a concrete 13 . He may try to solve a problem by using the theories 14 science or by experimenting through trial and error . Regardless of his method , he is working to get a 15 result : the construction of a harvesting machine , the burning of a light bulb , or one of 16 other objectives .
Most of the people who 17 the machines of the Industrial Revolution were inventors , not trained scientists . A few were both scientists and inventors . Even those who have 18 or no training in science might not have made their inventions 19 the groundwork had not been laid by scientists years 20 .
1. A. cases B. reasons C. factors D. situations
2. A. But B. And C. Besides D. Even
3. A. else B. near C. extra D. similar
4. A. possible B. effective C. necessary D. creative
5. A. production B. sources C. bases D . discoveries
6. A. employed B. created C. operated D. controlled
7. A. came B.arrived C. stopped D. appeared
8. A. less B. better C. more D. worse
9. A. real B. practical C. pure D. clever
10.A.happily B. occasionally C. unwillingly D. wholeheartedly
11.A.now B. and C. all D. so
12.A.seldom B. sometimes C. usually D. never
13.A.plan B. use C. idea D. means
14.A.of B. with C. to D. as
15.A.single B. only C. limited D. particular
16.A.few B. those C. many D. all
17.A.suggested B. developed C. supplied D. offered
18.A.little B.much C. some D. any
19.A.as B. if C. because D. while
20.A.ago B. past C. ahead D. before
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