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
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单项选择题
The word chronotherapy (second sentence, last paragraph) means a treatment which ______.
A．reduces the toxic effects by decreasing the amount of medicine-taking
B．balances the effect of the medicine in accordance with humans' different functions in a day
C．allows patients to choose the time to take medicine as they like
D．patients should follow the time of taking medicine according to the paper instructions
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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