单选题 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

【正确答案】 A

【答案解析】[试题分析] 细节题。
[详细解答] 根据本文倒数第二句...including hospitals， schools，resources，food and medicines to care for its people．显然，答案应为A。B，C两项的students和manpower re sources并不包含在内，由此判断，后三项都不正确。