请根据中文提示补充句子。

1. Look! The pandas are ________________ (睡觉). The monkeys are ________________ (荡秋千).

    They are cute.

2. Look! They ________________ (野餐) together. They are very ________________ (高兴).

3. Look at the children. The boys are ________________ (做实验) and the girls are ________________

   (收集树叶)

4. Chen Jie and Mike are ________________ (玩游戏) in the garden. They are ________________ (捉蝴蝶).

5. In the evening, my mother is ________________ (做饭) and my father is ________________ (扫地).

    They are busy now.

下列不能用来衡量电能质量的是（）。

A.频率质量

B.电能质量

C.波形质量

D.系统故障率