各种环境中照明吊灯安装高度不能达到规定者，应采用不超过（）伏的安全电压。

A.42

B.36

C.24

D.12

Directions:

A. Study the following picture carefully and write an essay of about 160-200 words.

B. Your essay must be written clearly on the ANSWER SHEET 2.

C. Your essay should meet the requirements below.

1) Describe the pictures,

2) deduce what is intended in the picture, and

3) point out its implications in our life.