The results suggest that brain aging can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within this normal range is related to variation in the rate of brain aging. write porter and landfield. This further suggests that chronic stress may accelerate the worsening of the hippocampus.

　　6 which of the following plays a key role in ones learning and memory?

　　A the kidneys

　　B the adrenal hormone

　　C the stress hormone

　　D the hippocampus

　　7 when the levels of cortisol go high ,the hippocampus

　　A may expand

　　B may shrink

　　C may disappear

　　D may function better

　　8 according to the passage, when people are under stress,

　　A the adrenal glands will produce cortisol

　　B the kidneys will shrink rapidly

　　C the hippocampus will produce cortisol

　　D the brain will work more efficiently

　　9 it app ears that when the hippocampus shrinks sue to high levels of cortisol, other brain regions

　　A may change dramatically

　　B may stop functioning

　　C may remain unaffected

　　D may be seriously damaged

　　10 the research conducted by porter and land field showed that

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