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1-5 ADBDC 6-10 ADCBC 11-15 BDBAC 16-20 DDDBA 21-25 DCBDA 26-30 ACBCC 31-35 BCDAB 36-40 CDDCA 41-45 BABCC 46-50 DABAB 51-55 BADBA 56-60 BCABA 61-65 DCBBC 66-70 ACBCD 71. in→on 72. trees后加were 73. he→who 74. still→yet 75. and→but 76. looking→look 77. has→had 78. blocked →blocking 79. √ 80. 去掉been One possible version: Is Recycling Textbooks a Good Suggestion? As we know, when senior students graduate from school, most of their textbooks are thrown away, which are still in good condition. What a great waste it is! A suggestion has been put forward that we should recycle the textbooks. I quite agree to the suggestion. For one thing, recycling textbooks can save a lot of natural resources, which are used to make textbooks. For another thing, senior students may have made plenty of useful notes on the pages. They are very helpful to those textbook users. Besides, in Australia and some other countries, recycling textbooks is popular. So I am for the suggestion. 搜狗(www.sogou.com)搜索:“textbooks”,共找到
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