题目内容

________ you sit in front of the computer all day while working, you’d better take exercise for at least an hour every day.

A. Even if
B. Even though
C. Since
D. As if

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A ship is safe if it stays in a habor. But this is not _______ it is built for.

A. what
B. how
C. why
D. where

python异常处理中触发自定义异常的关键字是___________。

python异常处理语句常用关键字有________,________,________,________。

python异常处理中常常用来进行单元测试的关键字是________________。

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