单项选择题

When a population doubles, the country involved needs twice as much of everything, including ______.

A．hospitals and medicines
B．schools and students
C．food and manpower resources
D．all of the above
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单项选择题
According to the passage, what helps to explain why the population problem has come on all of a sudden
A．The penny which doubles itself every day for one month.
B．The time span of at least two million years in human history.
C．An illustration of the exponential growth rate given by the author.
D．The large amount of money you would luckily make after the fourth week.
单项选择题
The word accepted in the last sentence of the first paragraph roughly means ______.
A．believed
B．assumed
C．received
D．reconciled
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