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A、Provide protection against mental illnesses. B、Make people more susceptible to illness. C、Weaken one’s immunity in the long ru
A、Provide protection against mental illnesses. B、Make people more susceptible to illness. C、Weaken one’s immunity in the long ru
admin
2023-01-31
25
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、Provide protection against mental illnesses.
B、Make people more susceptible to illness.
C、Weaken one’s immunity in the long run.
D、Produce a surprising healing effect.
答案
B
解析
本题问科学家们认为长期的压力会有什么后果。录音说科学家们承认,长期的压力会使人更容易生病,B项“使人们更容易生病”正确。可增强免疫力的是短期压力,而非长期压力,而且也不是可防止精神疾病,故排除A项“能防止精神疾病”。C项“从长远来看,会削弱一个人的免疫力”及D项“产生惊人的治疗效果”都未在录音中提及。
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0
大学英语六级
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