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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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

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