题目内容：
It can be seen from the passage that the earth's supply of natural medicines
A．may never be exhausted. B．may be dropping rapidly.
C．is surprisingly big.
D．is as rich as ever.
参考答案：
答案解析：
单选题：It can be seen from the passage that the earth's supply of n
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B．may be dropping rapidly.
C．is surprisingly big.
D．is as rich as ever.