问题 选择题

MnO2是化学课上用过的催化剂,下列说法中正确的是 [ ]

A.MnO2可以加快双氧水分解的速率

B.MnO2的质量在反应前后发生改变

C.MnO2的性质在反应前后发生改变

D.MnO2可以催化所有的化学反应

答案

答案:A

阅读理解

Young people should be enjoying the best time of their lives . but those in their twenties or thirties are in worse health than their parents ,a British survey has found .

Drinking too much , eating fast food and being _short of_________exercise  all have a bad influence on young people .As a result , the young are more likely to have headaches , catch colds or become stressed than their parents .

According to the survey , those aged between 18 and 34 are three times more likely to catch colds than the older people . The following are the main reasons .

The old people usually eat more healthily .More than four in ten old people eat five or more part of fruit or vegetables a day . It’s twice the number of the young men and woman .  Six in ten old people cook their own meals every day .., compared to less than one third of the young people . Almost 10% of the young people admit that they eat fast food for every meal and 2% say they only eat at restaurants .

The old people are also more likely to take a lot of exercise . 12% of them spend at 30 minutes doing exercise each day .  They are healthier .  However ,only 9% of the young do so .

根据短文内容,选择正确答案。

小题1:The survey was made in _________.

A.China

B. Japan

C. America

D.the UK小题2:The underlined phrase “short of “ means ________in Chinese .

A.缺乏

B.少于

C.短小

D.除------外小题3:According to the survey ,  the parents are less likely to ________than children .

A.feel relaxed

B.catch colds

C.do exercise

D. eat at home小题4:Among the old people ,_________in   100 usually have meals at home .

A. 10

B. 30

C. 40

D. 60小题5:According the survey ,____________young people take a lot of exercise .

A. 20%

B. 30%

C. 15%

D. 9%

单项选择题