单项选择题

A．The direction to fly in.
B．The distance to fly.
C．The height to fly.
D．The kind of food to find.
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单项选择题
A．An educational problem.B．A health problem.C．A Chemical problem.D．An environmental problem.
A．An educational problem.
B．A health problem.
C．A Chemical problem.
D．An environmental problem.
单项选择题
Candler was skillful at advertising and showed much imagination in understanding the potential.
A．Y
B．N
C．NG
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