If someone is having a heart attack, you should first:

A is the correct answer.
CPR usually last more than 5 minutes.
Imagine that you had spent 6 minutes doing CPR and found nothing better, so you called 120 and wait another 10 minutes for the doctors.
How much chance do you think the person would survive???
Therefore, it's better to call 120 quickly and do the CPR during the time when the ambulance is on its way.

B is the correct answer. Because when a person is having a heart attack, his or her life is in immediate danger. And it may take some time for the ambulance to come. So you should provide first aid before calling 120.

a吧

当有人出现心肌梗塞的情况，你首先应该打120急救电话

因为一般人不会第二种方法

如果有人心脏病发，你首先：
A，打120