2. 外语
  3. When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.

When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.

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问题 When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.
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答案does—去掉does
解析 译文：当一个原子的中子与另一个原子的原子核相碰撞，就会发生链式反应。
分析：考查从句。此句的when引导时间状语从句，时间状语从句中，when后应直接跟主语，does多余。故删掉。
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