正确答案: D

北美洲

题目：西洋参原产( )。

解析：D

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举一反三的答案和解析：

[单选题]

B．free C．protect D．remove

preventB．free

[单选题]What does the author expect to show by Jeff’s story ？

One should realize the wrong in his bad deeds.

[单选题]John's success has nothing to do with good luck. It is years of hard work hasmade him what he is today.

that

[单选题]The doctor is skilled at treating heart trouble and never accepts any gift from his patients, so he has a very good_____.

reputation