A．Europe．
B．The Caribbean Islands
C．Canada．
D．Mexico．
参考答案D
解析:
Where was corn probably first cultivated?
D.【精解】文中提到，哥伦布引进到欧洲的玉米原产自于墨西哥。故答案为D.
D.【精解】文中提到，哥伦布引进到欧洲的玉米原产自于墨西哥。故答案为D.
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A．It must be watered by people．
B．It has to be protected from stealing．
C．It has to be protected from natural disasters．
D．It will be eaten out by other animals．
