The passage indicates that ancient treatments for injury and disease were It can be seen from the passage that the earth’s supp

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问题 The passage indicates that ancient treatments for injury and disease were
It can be seen from the passage that the earth’s supply of natural medicines

选项 A、may never be exhausted.
B、may be dropping rapidly.
C、is surprisingly big.
D、is as rich-as ever.

答案B

解析
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