根据汉语提示完成下面的句子（每空一词）。

1. Eating regularly is as important as having ________ ________ ________ (健康的饮食).

2. Many ________ (疾病) are caused by bacteria (细菌).

3. People have cut down too many trees.                   ________ ________ (结果), the environment is getting worse and worse.

4. You should go out to play ________ ________ (而不是) just studying indoors.

5. In modern society, people ________ increasingly busy ________ (过……生活).

发行市场是证券的______级市场。 ( )

A．一

B．二

C．三

D．四