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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【21】rubber. They are,【2

Los Angeles has planted 2,000 rubber trees down the middle of one of its main streets. These trees do not【21】rubber. They are,【2

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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【21】rubber. They are,【22】, made of rubber. Mr. Joe Dynamo, a spokesman for Los Angeles【23】council, explained the reasons. He said:
    "These【24】are representative of our virtual society. We have polystyrene grass on our golf【25】. We have non-milk powder【26】our coffee. We【27】copies in plastic of old wooden furniture. We have fiberglass tombstones.【28】shouldn’t we have trees made of rubber?"
    "At 50 miles an hour,【29】motorist will see any difference. And our preservation【30】will be lower. You give the trees an annual rinse (清洗) with detergent, and【31】them off twice a year. We【32】a lot of money because transplanting, pruning, weeding and leaf-collection are all【33】. And we have a 60-year【34】guarantee on each plant. This is rationalization at【35】best. "
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。选项C是正确的。
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