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．
参考答案C
解析:
Why would corn die out without human care?
C.【精解】文中提到，曾经有好多次因发生自然灾害使玉米种植受损，种植玉米的人付出了极大的努力来保护官以免遭到破坏．而日．他们设法收集种子来扩大种植面积。故答案为C.
C.【精解】文中提到，曾经有好多次因发生自然灾害使玉米种植受损，种植玉米的人付出了极大的努力来保护官以免遭到破坏．而日．他们设法收集种子来扩大种植面积。故答案为C.
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B．The man has called the wrong number.
C．The man should write to the person in charge directly.
D．She is too busy to help the man.