The passage indicates that ancient treatments for injury and disease were ______. It can be seen from the passage that the eart

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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

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