2. 专升本
  3. Scientists estimate that smoking can reduce life expectancy by around 12 years________average.

Scientists estimate that smoking can reduce life expectancy by around 12 years________average.

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问题 Scientists estimate that smoking can reduce life expectancy by around 12 years________average.
选项 A、on
B、with
C、at
D、in
答案A
解析 on average为固定搭配，意为“按平均值，平均”。故选A。
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