题目内容

Grandpa() last night at midnight.
A passed away
B passed down
C passed by
D passed over

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This semester is() to a close.
A making
B walking
C driving
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A marry
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核动力厂一回路的辅助系统：补给水系统，乏燃料池冷却及净化去污清洗系统按其所起的作用可以被归为()。

A. 保证反应堆和一回路系统正常运行的系统
B. 为核动力厂一回路系统在运行和停堆时提供必要冷却的系统
C. 控制和处理放射性物质，减少对自然环境放射性排放的系统
D. 以上三者均不正确