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 life.

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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

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