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
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.
单项选择题
It can he inferred from the passage that the author was （）

A．a scientist as well as a naturalist
B．a naturalist but not a scientist
C．no more than a born naturalist
D．first of all a scientist
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