单项选择题

According to the author, many sleeping disorders are caused by ______.

A．other diseases
B．pre-bedtime exercises
C．improper sleep patterns
D．Chronic fatigue syndrome

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单项选择题

For our bodies to function properly, we should ______.

A．sleep for at least eight hours per night
B．believe that we need less sleep as we age
C．adjust our activities to the new inventions
D．be able to predict the rhythms of our biological clocks

单项选择题

According to the passage, which of the following statements a bout the right hemisphere of the brain is accurate

A．It has the potential to serve as a "language area".
B．It controls the ability to comprehend but not the ability to speak a language
C．If it is damaged, gross motor control of the right side of the body may be affected.
D．It is the right where Wernick's area is located.

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