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  3. Los Angeles has planted 2, 000 rubber trees down the middle of one of its main streets. These trees do not【C1】______rubber. They

Los Angeles has planted 2, 000 rubber trees down the middle of one of its main streets. These trees do not【C1】______rubber. They

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问题     Los Angeles has planted 2, 000 rubber trees down the middle of one of its main streets. These trees do not【C1】______rubber. They are, 【C2】______, made of rubber. Mr. Joe Dynamo, a spokesman for Los Angeles【C3】______council, explained the reasons. He said:
    "These【C4】______are representative of our virtual society. We have polystyrene grass on our golf【C5】______. We have non-milk powder【C6】______our coffee. We【C7】______copies in plastic of old wooden furniture. We have fiberglass tombstones.【C8】______shouldn’t we have trees made of rubber?"
    "At 50 miles an hour, 【C9】______motorist will see any difference. And our preservation【C10】______will be lower. You give the trees an annual rinse(清洗)with detergent, and 【C11】______them off twice a year. We【C12】______a lot of money because transplanting, pruning, weeding and leaf-collection are all【C13】______. And we have a 60-year【C14】______guarantee on each plant. This is rationalization at【C15】______best.
【C13】
选项 A、essential
B、accidental
C、unnecessary
D、necessary
答案C
解析 因为是假树，除草、扫落叶当然就没有必要了。C项是正确的。
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