题型:任务型阅读 题类:常考题 难易度:普通
四川省江油中学2019-2020学年高二下学期开学考试英语试题
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 synapses 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.
B. It's as if the brain is preserving its most important memories.
C. Similarly, when people go for a few days without sleeping, they get sick.
D. The processes take place to stop our brains becoming loaded with memories.
E. That's why students do better in tests if they get a chance to sleep after learning.
F. "Sleep is the price we pay for learning," says Giulio Tononi, who developed the idea.
G. Tononi's team measured the size of these connections, or synapses, in the brains of 12 mice.
Why do many people play sports? You might say “to get exercise'' and you'd be right. To have fun? That's true, too. But there's more.{#blank#}1{#/blank#}According to the Women's Sports Foundation, girls who play sports get a lot more than just fit.
Girls who play sports do better in school. {#blank#}2{#/blank#}But research shows that girls who play sports do better in school than those who don't. Exercise improves learning, memory, and concentration, which can give active girls an advantage in the classroom.
Girls who play sports learn teamwork and goal-setting skills. Sports teaches valuable life skills. When you working with coaches, trainers, and teammates to win games and achieve goals, you're learning how to be successful. {#blank#}3{#/blank#}
Sports are good for a girl's health. In addition to being fit and maintaining a healthy weight, girls who play sports are also less likely to smoke. And later in life, girls who exercise are less likely to get breast cancer.
{#blank#}4{#/blank#} Girls who play sports feel better about themselves. Why? It builds confidence when you know you can practice, improve, and achieve your goals. Sports are also a feel-good activity because they help girls get in shape, maintain a healthy weight, and make new friends.
Exercise cuts the pressure. Playing sports can lessen stress and help you feel a little happier. How? {#blank#}5{#/blank#} Friends are another mood-lifter. And being on a team creates tight bonds between friends. It's good to know your teammates will support you—both on and off the field!
A. Please take action to play games. B. Playing sports boosts self-confidence. C. Playing sports is good for your grades. D. In fact, there are at least 5 more reasons. E. Those skills will serve you well at work and in family life. F. You might think that athletics will take up all your study time. G. The brain chemicals released during exercise improve a person's mood. |
试题篮