根据下列化合物与单质相互转化的关系回答：

（1）若乙的溶液是浅绿色，Y是红色固体，则X是______，如：（用化学方程式表达）______；

（2）在常温下若乙是气体，则X是______，如：（用化学方程式表达）______；

（3）在常温下若甲是固体，乙是无色液体，则X是______，如：（用化学方程式表达）______．

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 drawing,

2) interpret its meaning, and

3) point out its implications in our life.