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
Which of the following is NOT true ( )
A．The adrenal gland is located on top of the kidney.
B．Each kidney is composed of two adrenal glands.
C．The medulla is inside the cortex.
D．The cortex and the medulla have different functions.
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