题目内容

These children ____(看待) their free time after school as an opportunity for personal development.

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____(每天) they return from school and unlock the door to their home with the key hanging around their necks.

Many factors must be taken into consideration: the children's personality and maturity, the amount of time the children will be alone, the safety of the neighborhood, accessibility of help ____(在...情况下) an emergency.

Given the reality of the situation, the question to ask is: how can an optimum plan be ____(制定出) to deal effectively with the situation.

在原电池中,盐桥的作用是 ( )。

A. 沟通电路
B. 消除液接电位
C. 保护电极
D. 使电子从正极传到负极

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