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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. The

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

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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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