题目内容：

听下面一段独白，回答以下小题。

1.What is the speaker mainly talking about?

A. The cause of a heart attack.

B. The advice on dealing with a heart attack.

C. The treatment for a heart attack.

2.What should one do to help a patient with a heart attack?

A. Send the patient to hospital immediately.

B. Not give the patient anything to drink or eat.

C. Leave the patient sitting.

3.What do we know about patients who have heart attacks?

A. Most of them can recover completely.

B. Some of them are easier to suffer heart attacks again in the future.

C. Half of them won't suffer heart attacks any more in the future.