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

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热门试题

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

The author can't remember his relatives clearly because（）

A．he didn't live very long with them
B．the family was extremely large
C．he was too young when he lived with them
D．he was fully occupied with observing natur