单项选择题

A．To fly one following another.
B．To fly without stopping.
C．To use land features as the guide.
D．To take one route only.
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S4. What’s the main idea of Paragraphs 4 and 5
单项选择题
A．By talking to an expert.B．By reading an article.C．By attending an exercise class.D．By listening to the radio.
A．By talking to an expert.
B．By reading an article.
C．By attending an exercise class.
D．By listening to the radio.
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