问题 选择题

25℃时,在25 mL 0.1 mol/L的NaOH溶液中,逐滴加入0.2 mol/L的CH3COOH溶液,溶液的pH与醋酸体积关系如右图,下列分析正确的是                                                    (   )

A.B点的横坐标a=12.5

B.C点时溶液中有:c(Na+)>c(CH3COO-)>c(H+)>c(OH-

C.D点时溶液中有:c(CH3COO-)+c(CH3COOH)=2c(Na+

D.曲线上A、B间的任意一点,溶液中都有:c(CH3COO-)>c(Na+)>c(OH-)>c(H+

答案

答案:C

写作题

Zhang Li lies in bed sadly. The 24-year-old young man lost his right leg because of a blood disease (血液病). The doctor said that his 10 years of smoking had caused the disease.

“I first smoked a cigarette when I was in Junior 3. It made me feel like a man and I thought it looked cool. Now I know I was really wrong,” said Zhang.

According to the 2008 China Tobacco Control report (中国烟草控制报告), 130 million young people who are under 18 years old have tried smoking. Fifteen million of them are addicted (上瘾的).

The report came out on May 31, World No-Smoking Day. (83)It also found that nearly 68% of teenage smokers smoked their first cigarette before the age of 13. Those living in big cities started even earlier.

“Some tobacco companies try to make cigarettes cool and attractive. It’s just to make money,” said Yang Gonghuan, a doctor. In fact, smoking is one of the top killers in China. Each year 1 million people die from smoking-related (与吸烟有关的) diseases. Smoking causes illnesses like lung cancer and heart disease.Doctors say that the younger a person starts smoking, the worse it will be. If a person starts smoking as a teenager, he or she may live twenty-two years less than non-smokers. 

根据短文内容将下列句子补充完整。

小题1: Zhang Li’s disease was caused by ______________________________

小题2: Doctors think that non-smokers will live ___________________ longer than those who began smoking as a teenager.

将短文中划线的句子译成汉语。

小题3:______________________________________________________________________

根据短文内容回答问题。

小题4:Why did Zhang Li smoke at first? ___________________________________________

小题5:If someone smokes too much, what diseases can he develop?

_______________________________________________________________________

单项选择题 A1/A2型题