问题 选择题

取三张蓝色石蕊试纸润湿后贴在玻璃片上,然后按顺序分别滴加10%盐酸、98%的硫酸溶液、新制氯水,三张试纸最终变成[ ]

A.白色、红色、白色

B.红色、黑色、白色

C.红色、红色、红色

D.白色、黑色、白色

答案

答案:B

阅读理解

阅读理解

       Most people smoke the first cigarette when they're teenagers(青少年) .In fact,80% of smokers

begin the habit before they turn 18. Here are a few facts about cigarette smoking,which are worth

keeping in mind when your friends and relatives light up (点燃) cigarettes.

       ●Nearly 70% of people who smoke say they wish they could quit. Teens who smoke cough three

times more thanteens. who don't smoke.

       ●Smoking causes cancer, heart disease, lung disease and so on.

       ●More than 434,000 Americans die each year from smoking-related diseases.

       ●Smoking makes you feel weaker and more tired because it prevents oxygen from reaching your

heart.

       ●Smoking decreases (减少) your sense of taste and smell,making you enjoy things like flowers

and fruit a little bit less.

       ●Smoking hurts the people around you:More than 53,000 people die each year from second-hand

smoke.

1.        out of 10 smokers begin to smoke before the age of 18.

A. 6      

B. 7      

C. 8      

D. 9

2. What's the meaning of the underlined word " prevent" ?

A. stop          

B. develop

C. improve      

D. protect

3. The writer wrote this passage mainly to the people aged        .

A. three to nine            

B. thirteen to nineteen

C. thirty to forty            

D. fifty to sixty

4. What is this passage mainly about?

A. Cigarette smoking can cause cancer.

B. You should enjoy fruit a lot.

C. Second-hand smoke may kill the people around us.

D. A few facts about cigarette smoking you should know.

单项选择题 A3/A4型题