问题 填空题

某同学决定到一口干涸的深井探险,为了安全,此同学进入深井前需进行______实验,经过检验氧气浓度过低,进入时应携带______.

答案

由于深井或深洞内含有较高的二氧化碳,人进入后会对生命造成威胁,故进入之前要做灯火实验;

氧气浓度过低时,会造成呼吸困难或生命危险,故答案为:进入时要携带氧气瓶或氧气袋.

阅读理解

     Each new school year brings fresh reminders of what educators call the summer learning gap. Some

call it the summer learning setback. Put simply, it means the longer kids are out of school, the more they

forget. The only thing they might gain is weight. Recent studies show that children gain weight more

quickly in the summer vacation than when they are in school.

     Most American schools follow a traditional nine-month calendar. Students get winter and spring

breaks and about ten weeks of summer vacation. Some schools follow a year?round calendar. They

hold classes for about eight weeks at a time, with a few weeks off in between. But many experts point

out that the number of class days in a year-round school is generally the same as in a traditional school.

     Last year, a study at Ohio State University reported that year-round students did not learn any more

than other students. Lead researcher Paul von Hippel said "year-round schools don't really solve the

problem of the summer learning setback. They simply spread it out across the year".

     Across the country, research shows that students from poor families fall farther behind over the

summer vacation than other students. Experts say this can be prevented. They note that many schools

and local governments offer the programs that can help.

     But calling them "summer schools" could be a problem. The director of the summer learning center

at Johns Hopkins, Ron Fairchild, recently wrote about this issue on his blog.

     He said that in American culture, the idea of summer vacation is connected to the beliefs about

freedom and the joys of childhood. He said research with groups of different parents in Chicago and

Baltimore found that almost all strongly disliked the term summer school. They said it created an image

of children being forced to do work they missed during the school year.

1. Which of the following is the result of the long summer vacation?

A. Kids become much stronger.

B. More kids drop out of school.

C. Kids become poor in learning.

D. Kids take part in all kinds of activities.

2. Some American schools have their vacations ________.

A. every two months  

B. every few weeks

C. every three months  

D. every four months

3. The study at Ohio State University suggests that ________.

A.  the traditional calendar is better than the year-round one

B. the year-round calendar is better than the traditional one

C. the traditional calendar is as bad as the year-round one

D. the year-round calendar is the same as the traditional one

4. The summer vacation is most likely to have bad effect on the kids ________.

A. who are too young  

B. whose families are poor

C. who are too naughty  

D. who don't work hard

5 According to American culture during the summer vacation kids ________.

A.  should try their best to improve their lessons

B. must choose to take part in one of the programs

C. should do what they like and enjoy themselves

D. must be forced to make up for their poor lessons

判断题