单项选择题

A．It must be the right height.
B．It must have several gears.
C．It must have good tires.
D．It must be the right weight.
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单项选择题
A．Two.B．Twenty-six.C．Twenty-eight.D．Thirty.
A．Two.
B．Twenty-six.
C．Twenty-eight.
D．Thirty.
单项选择题
A．Many species have developed a habit of migration.B．Many species have become less sensitive to climate.C．Many new species have come into existence.D．Many species have moved further north.
A．Many species have developed a habit of migration.
B．Many species have become less sensitive to climate.
C．Many new species have come into existence.
D．Many species have moved further north.
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