单项选择题

The author's main purpose of writing the passage is ________.

A．to explain the specific functions of various hormones
B．to provide general information about hormones
C．to explain how the term "hormone" evolved
D．to report on experiments in endocrinology

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单项选择题

Which of the following conclusions does the passage support

A．The human body requires large amounts of most hormones.
B．Synthetic hormones can replace a person's natural supply of hormones if necessary.
C．The quantity of hormones produced and their effects on the body are related to a person's age.
D．A short child of tall parents very likely has a hormone deficiency early in life.