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

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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

单项选择题

What could be said about the adrenalin（）

A．It is secreted by the kidneys into the bloodstream.
B．It is hormone that prepares the body for emergencies.
C．It is the only useful hormone produced in the body.
D．It is essential to sustain lif