参考答案
21. were lost 22. that / which
23. But 24. at / with 25. harmful 26. falling 27. an 28. other 29. they 30. about 31-35 BDACD 36-40 CBBAC 41-45 DCABA 46-50 DABCC
51-55 DCBDB 56-60 ACBCB 61-65 ABDAD 66-70 DEBGA 短文改错：
71. ... while it happened. while → when
72. ..., unexpected fell into ... unexpected → unexpectedly 73. ... was washing away. washing → washed 74. ... and act faster. faster → fast 75. All of the sudden, ... the → a 76. ... got to there, ... 去掉to 77. ..., but hung his ... but → and 78. She could see ... She → He 79. ... he is able ... is → was 80. ... is able grab ... able后加to One possible version:
When I was on the Earth, I worked in a big, crowded city and lived a busy life. Most people there lived in high-rise flats and drove to work. As a result, there were frequent traffic jams and accidents. And the air was full of smoke.
But there were many ways for people to get relaxed after work. Some went to cinemas or theaters to watch movies or plays. Some preferred to play all kinds of sports games in parks. Others held parties to meet new friends and entertain themselves.
So you see, we have a different lifestyle here. Anyway life is changing for the better.
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