从方框中选词并用其适当形式填空 

Many____like playing computer games after school. 
Rui Chenggang is a ____ from CCTV. 
Mrs Green likes writing ____for children.
As a____ ,  he works late at night.
During big festivals,  the ____ are very busy.  

读课文《激光的话》，根据拼音写词语。

我叫“激光”，是人（rén lèi）____制造出来的一种（tè shū）____的光。

 晓宇设计了用吸盘测量大气压值得实验，请帮助晓宇做好以下工作

已知y=2x，z=$\frac{1}{y}$，那么z与x之间的关系是（　　）