2. 外语
  3. The output of coal in 1999 was _______________ (比 1972 年增加了五倍).

The output of coal in 1999 was _______________ (比 1972 年增加了五倍).

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问题 The output of coal in 1999 was _______________ (比 1972 年增加了五倍).
选项
答案six times as much as that of 1972
解析 ①six times as much as表示“增加五倍”；此处比较的是the output of coal．为不可数名词，因此用as much as，不能用as many as；②that代替题干句中的the output of coal。
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