According to the article，when people feel too worried or nervous or when they overwork．
A.the adrenal glands will produce a stress hormonE.
B.the kidneys will produce adrenal glands．
C.the hippocampus will produce high levels of cortisol in the blooD.
D.the brain will work more effectively．

A.A.the
B.the
C.the
D.the

【参考答案】

A
应激激素由肾上腺所释放。选项D是错误的，因为并不是通过产生某种物质使人的．