单项选择题

How long did it take her to fly to Australia

A．17 days.
B．18 days.
C．19 days.
D．20 days.
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单项选择题
What is the passage mainly about
A．Amy Johnson's life story as a female flyer.
B．Amy Johnson's great contribution to aviation.
C．Amy Johnson's determination to be a pilot.
D．Amy Johnson's flight to Australi
单项选择题
According to the passage, what causes potassium and water in the mimosa to shift from some cells to others
A．Signals from the pulvini.
B．Movements of the leaf stalks.
C．Electrical impulses.
D．Nerve signals.
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