听一段材料，回答下面几个小题。
What is the speaker talking about in the news?
A. The no-smoking law.
B. A city in the U.S.
C. Smoking and heart attack.
What does the doctor think of the no-smoking law?
A. It makes no sense.
B. It's good for the public.
How many people suffered from heart attack in the 18 months before the law was passed?
A. Nearly three hundred.
B. A little more than two hundred.
C. Nearly five hundred.