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问题 填空题

如图所示，若连接B、C接线柱，则L1、L2______联，若使灯L1、L2并联，则接线柱A与B连接，接线柱C 与______连接．

答案

如图所示，若连接B、C接线柱，电路中电流只有一条流通路径，则L1、L2 为串联电路；若接线柱A与B连接，接线柱C与D连接，则电路中有两条电流的流通路径，所以灯L1、L2并联．

故答案为：串；D．

完形填空

读下面一段短文，根据上下文意思用方框内的所给词的适当形式填空。

In  小题1:（I）school , the rules for students are very strict, but I think they are necessary. Following the rules is everyone’s duty. They keep the students from fighting, smoking,  小题2:（make）noise in class and so on.

Most of the  小题3: ( student) can follow the rules. But some problem students often break the rules. They destroy public things, such as desks,windows, trees and flowers. So they 小题4:（punish）. I like the rules, because they make our school 　小题5:　 （safety）,they make it a beautiful environment for us to study.
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填空题

一平面截一球得到直径是6cm的圆面，球心到这个平面的距离是4cm，则该球的体积是               .
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