题目

When products made in factories _____, they are thrown away as garbage. 　　A. come to an end    B. are put to use 　　C. are used up       D. wear out 答案：D 解析: wear out本题中意指（become useless form continued use of wear）用坏，穿破，如：The machine will soon wear out.(这机器即将用坏。)come to and end(结束)，put ... to use(投入使用), use up(用完)， come into use(开始投入使用)。

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