单项选择题

It is ______ that mainly helps you respond to a dangerous or stressful situation. ( )

A．a signal sent by your brain
B．the special function of the adrenal gland
C．all stimulated parts of your body
D．All of these
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单项选择题
What do you suppose the author will go on to discuss in the following paragraphs ( )
A．the brain system.
B．functions of kidneys
C．other human organs related to the kidneys
D．reactions of the body to stress and danger
单项选择题
In this passage, the author is mainly discussing the function of （）

A．the human brain
B．glands and systems in the body
C．the cortex of the adrenal gland
D．the medulla of the adrenal gland
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