单项选择题

The best time to take medicine for heart disease patients is ______.

A．at noon
B．at night
C．in the morning
D．in the afternoon
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单项选择题
The benefit of biological clocks for humans is ______.
A．passengers can choose the flight time to adjust biological clocks
B．people may sleep at daytime for better biological clocks condition
C．shift workers can avoid their biological clock disorders
D．patients can get the best result by taking medicines at different time
单项选择题
According to the passage, what may cause the periodic change of certain plants
A．It is caused by intensity of sunlight.
B．It is decided by humans' daily activities.
C．It is the result of chemical reactions by scientist.
D．It is up to the regular recycling of time.
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