单项选择题

The passage is mainly concerned with the ______.

A．geographical distribution of plant and animal species
B．location and purpose of the pulvini
C．appearance of the mimosa
D．process that causes movement in the mimosa

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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.

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