50. Students learn science and (科技) at school.
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2.(2015 湖南永州，18.★☆☆) I get up than him every day.
A. early B. earlier C. earliest
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5. (2014 貴州齡西南中考) He didn’t go to school yesterday he was ill.
A. because B. because of
C. if D. so
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Even during the ancient days,traffic in big cities was often heavy. Police officers had to stand at busy crossings the whole day. They often got 21 after they worked all day long. So they 22 a small lantern (提燈) with red and green lights. Red meant “ 23 ” and green meant “be careful” .The lantern was 24 by a lever (控制桿) below so that the right light faced traffic. 25 ，this lantern was often crispy because of much gas in the light bulb.
As cars were 26 ,the situation got even worse. An American policeman,William Potts,decided to do 27 to solve the problem.
One day,while he was walking along a railway,Potts 28 the railroad signals. Then he got an idea—why not use them on 29 ? So Potts used red,yellow,and green railroad lights to make the 30 fourway traffic lights in the world. It was used in 1920 on a corner in his city. In the year,fifteen of the new lights were used across his state.
21. A. tired B. happy C. busy D. sleepy
22. A. bought B. produced C. carried D. created
23. A. remain B. stop C. rise D. go
24. A. knocked B. divided C. threw D. operated
25. A. However B. Besides C. Instead D. Even
26. A. found B. invented C. discovered D. seen
27 .A. everything B. anything
C. something D. nothing
28. A. broke B. obeyed C. guided D. noticed
29. A. buildings B. streets C. cars D. courts
30. A. first B. other C. next D. last
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A What did you do last night?
B：I read a book.
A：You read a book? 56 ?
B：It is about the life in 2100.
A ： Really? 57 ?
B：Oh,the life in 2100 will be quite different from the life we have today.
A：Will robots help people do all kinds of difficult work?
B：58 . People will just need to do some very easy and comfortable work.
A：59 ?
B：People will just need to work fifteen hours a week.
A：60 ?
B：No,they won't. They will study on the Internet at home instead of going to school.
A：That sounds interesting. Fm looking forward to the life in 2100.
56. ?
57. ?
58. .
59. ?
60. ?
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