单项选择题

When did Amy Johnson become interested in flying

A．In 1923.
B．In 1930.
C．After she received a BA
D．After graduation from Yorkshire University.
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单项选择题
It can be inferred from the passage that the mimosa is called the sensitive plant because it ______.
A．reacts to outside stimulation
B．has smaller leaves than most other plants
C．depends on organs called pulvini
D．contains potassium and water
单项选择题
According to the passage, the sensitive plant's leaves move quickly when parts of the pulvini ______.
A．drop off
B．become limp
C．revolve
D．twitch
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