单项选择题

A．She watched a movie all night.
B．She had an eye operation.
C．She took an exam all night long.
D．She was studying all night.
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单项选择题
A．Their lack of concentration resulting from mental stress.B．The lack of consideration for them in equipment design.C．The probability of their getting excited easily.D．Their slowness in responding.
A．Their lack of concentration resulting from mental stress.
B．The lack of consideration for them in equipment design.
C．The probability of their getting excited easily.
D．Their slowness in responding.
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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