单项选择题

A．A certain chemical in their bodies.
B．The change of certain circumstances around them.
C．A certain temperature.
D．A certain season in the year.
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单项选择题
A．He is a film director of Science Fiction.B．He is a writer of Science Fiction.C．He is a scientist who researches on how to freeze a body and bring it back to life later.D．He is a doctor who treats terminal illnesses.
A．He is a film director of Science Fiction.
B．He is a writer of Science Fiction.
C．He is a scientist who researches on how to freeze a body and bring it back to life later.
D．He is a doctor who treats terminal illnesses.
单项选择题
A．They were never sent.B．They eventually arrived.C．They were taken away.D．They went to the wrong address.
A．They were never sent.
B．They eventually arrived.
C．They were taken away.
D．They went to the wrong address.
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