题目内容
【题目】When a child sits down in front of a computer, it is not only the material he views but the length of time he spends on computer that can influence his total social, physical and mental well-being. 【1】
Computer Use and a Child’s Physical Well-being
Excessive (过多的) screen time is harmful to a child’s health. 【2】 Staring at a bright computer screen for hours on end can cause nearsightedness and eye focusing problem.
Computers VS. Active Play
【3】 Perhaps the greatest concern about the overuse of computers in homes and in schools is that it interferes with a child’s active playtime. Active play is necessary for overall physical health and greatly reduces the risk of childhood obesity.
Computers as Learning Tools
When used in moderation, computers are still useful tools for learning. 【4】 Thanks to the Internet, kids are writing more than ever. For the first time, children are spending time writing detailed reviews of radio games and movies.
Practice Computer Safety
To make sure computers are helping and not harming your children, reduce glare on the computer. 【5】 A computer is a useful tool only when used in moderation.
A. However, with computers, moderation is key.
B. Active play is important for a child’s development.
C. The greatest physical risk of too much computer use is eyestrain.
D. Computers help kids better understand visual images like diagrams.
E. Carefully monitoring computer use can be a great way to promote a child’s learning.
F. Don’t forget to install child safety software so children don’t come across dangerous websites.
G. Too much computer time, even on “Educational sites,” can have a negative influence on a child’s overall health.
【答案】
【1】G
【2】C
【3】B
【4】D
【5】F
【解析】本文作者针对如何让孩子们安全适度地使用电脑这一问题,给出了自己的一些建议。
【1】语义理解题。由When a child sits down in front of a computer, it is not only the material he views but the length of time he spends on computer that can influence his total social, physical and mental well-being.可知这里意思是使用电脑太长时间,即使是教育网站,对孩子的整体健康也会有不利影响,选G。
【2】语义理解题。由Staring at a bright computer screen for hours on end can cause nearsightedness and eye focusing problem. 可知这里意思是使用电脑太长时间的最大的身体风险是视疲劳,选C。
【3】语义理解题。Perhaps the greatest concern about the overuse of computers in homes and in schools is that it interferes with a child’s active playtime.这里提到了积极的活动,故选B。(积极的活动对一个孩子的发展很重要。)
【4】语义理解题。由When used in moderation, computers are still useful tools for learning.和 Thanks to the Internet, kids are writing more than ever. For the first time, children are spending time writing detailed reviews of radio games and movies.可知这里提到了适度使用电脑的好处,故选D。(电脑能够帮助孩子们更好地理解像图表这样的视觉影像。)
【5】语义理解题。由To make sure computers are helping and not harming your children, reduce glare on the computer. 和A computer is a useful tool only when used in moderation.可知这里意思是不要忘记安装儿童安全软件,这样孩子们就不会碰到危险的网站,选F。
【题目】根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Every animal sleeps,but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month.
One idea is that sleep helps us strengthen new memories. We know that, while awake,fresh memories are recorded by reinforcing (加强)connections between brain cells, but the memory processes that take place while we sleep have been unclear.
Support is growing for a theory that sleep evolved so that connections between neurons(神经元)in the brain can be weakened overnight, making room for fresh memories to form the next day.
Now we have the most direct evidence yet that he is right. The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep,showing that the connections between neurons weaken while sleeping.
If Tononi`s theory is right, it would explain why, when we miss a night`s, we find it harder the next day to concentrate and learn new information —our brains may have smaller room for new experiences.
Their research also suggests how we may build lasting memories over time even though the synapscs become thinner. The team discovered that some synapses seem to be protected and stayed the same size. “You keep what matters,” Tononi says.
A. We should also try to sleep well the night before. |