Directions: Water is probably most important for life, but we are going to face a shortage of water.
There has been a discussion recently on this issue in a newspaper. Write an essay to the newspaper to express your views.
Your essay should make full use of the following statistics and should cover these points:
(1) the current situation of water in China;
(2) the cause of the problem;
(3) your suggestions of solution.
You should write about 200 words.

典型心绞痛病人舌下含化硝酸甘油后，疼痛消失时间多在（）。

A.几秒钟以内

B.1～2分钟

C.10～15分钟

D.20分钟左右

E.30分钟以上