题目内容：

Li Chuang is a 15-year-old boy, but he has been a smoker for three years. His teeth and fingers have turned a bit yellow.

“I first tried smoking after watching TV. It makes me feel excited and I think it looks cool,” he said. Not all students smoke as much as Li but there are lots of child smokers. A report says 32% of boys and 13% of girls in middle schools in China have smoked. Some are as young as 11 when they first try!

May 31st is World No-Tobacco Day. Health expert（专家） are asking young people not to smoke.

Doctors say smoking can make people get illnesses, like lung（肺） cancer.

Not only that smoking costs a lot of money, too!Stop smoking, children! It’s bad for your health.

根据短文内容，选择正确答案。

1.Why is Li Chuang’s teeth yellow?

A. Eat too much candy.    B. Don’t brush his teeth.

C. Drink lots of juice.    D. Smoking.

2.Li Chuang began to smoke when he was _____.

A. 12    B. 13    C. 15    D. 16

3.More _____ have smoked than _____ in middle schools in China.

A. girls, boys    B. boys, girls

C. students, teachers    D. workers,teachers

4.The words “World No-Tobacco Day” means “____” in Chinese.

A. 世界无癌日    B. 世界节能日

C. 世界无烟日    D. 世界无车日

5.Which of the following is true?

A. Doctors do not smoke.

B. Some kids begin to smoke when they are 11 years old.

C. Smoking doesn’t cost much money.

D. Li Chuang was ill.