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A、They began to get irritated and restless. B、They began to show signs of depression. C、The growth of their new brain cells doub
A、They began to get irritated and restless. B、They began to show signs of depression. C、The growth of their new brain cells doub
admin
2023-01-31
27
问题
Stress is often depicted as negative, but research shows that moderate amounts of it can be beneficial for your brain and your body.
First, the benefits for the brain. Studies have shown that short periods of stress can actually bolster cognitive functioning. Researchers discovered that placing rats in a stressful situation for just a few hours doubled the growth of new brain cells. The rats also did better on a memory test later on. Scientists think the same thing happens in humans. But how does stress improve memory? It’s simple. When your brain cells multiply, your memory can improve. Viewed from a biological perspective, this makes sense because animals that are better at remembering dangerous situations can avoid them in the future. If an animal encounters a predator and escapes, for example, it’s important to remember where and when that encounter happened. Experts assert that the same principle applies to humans.
Now, let’s turn to how stress benefits the body. This may come as a surprise to laymen, but experts say that stress can keep you from getting sick. Scientists concede that chronic stress can make you more prone to illness, but research shows that short periods of stress can actually provide some protection against getting sick because it increases your immune functioning. One study shows that rats that experienced brief stress had a surge of immune cell response, which makes the immune system better prepared to fight illness. For humans, there is even evidence that experiencing stress before getting vaccinated could help make vaccines more effective.
9.What did researchers discover about rats placed briefly in a stressful situation?
10.Why do people tend to have clearer memories of dangerous situations they have encountered?
11.What do scientists believe chronic stress can do?
选项
A、They began to get irritated and restless.
B、They began to show signs of depression.
C、The growth of their new brain cells doubled.
D、The rate of their growth increased dramatically.
答案
C
解析
本题问让老鼠短暂地处在压力环境中,研究人员有什么发现。录音说,老鼠处在压力中仅几个小时,新脑细胞的生长就会增加一倍,C项正确。录音中说的是新脑细胞的生长就会增加一倍。而不是老鼠的生长速度急剧增加,排除D项。A项“它们开始变得烦躁不安”、B项“它们开始出现抑郁症的症状”未在录音中提及。
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0
大学英语六级
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