单项选择题

A．His academic advisor.
B．Another student.
C．A ski instructor.
D．The college dean.
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单项选择题
A．Whether the greenhouse effect can be detected and checked.B．Whether the greenhouse effect will lead to food shortage.C．Whether the global warming will speed up in the future.D．Whether the greenhouse effect will affect their own lives.
A．Whether the greenhouse effect can be detected and checked.
B．Whether the greenhouse effect will lead to food shortage.
C．Whether the global warming will speed up in the future.
D．Whether the greenhouse effect will affect their own lives.
单项选择题
A．His father.B．His mother.C．His brother.D．His sister.
A．His father.
B．His mother.
C．His brother.
D．His sister.
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