单项选择题

A．The effects of caffeine.
B．Some causes of headaches.
C．How to do well on exams.
D．Problems with the student cafeteria.
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单项选择题
A person can be more lonely among men than by himself at home because ________.
A．loneliness is a state of mind
B．loneliness is not the same as being alone
C．solitude is not measured in miles
D．all of the above
单项选择题
The example of the farmer and the students shows that________ .
A．men are not lonely when they are working
B．work satisfies man’’s need for solitude
C．solitude is a necessary condition of work
D．men need recreation with men after working
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