填空题

The problem of population is mainly man - made.

【参考答案】

Y
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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 alter working
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
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