单项选择题

A．Doctors thought that the human body lives in a stable state.
B．The science of chronobiology is sparking a medical revolution.
C．More people die of heart attacks on mornings than on evenings.
D．Chronobiology helps us improve our health and survive.
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单项选择题
What has happened to the Vrain School District
A．A huge financial problem has arisen.
B．Many schools there are mismanaged.
C．Lots of teachers in the district are planning to quit.
D．Many administrative personnel have been laid off.
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