题目内容
（请给出正确答案）
[主观题]
The main idea of the second paragraph is that______.A．a country's wealth depends on many f
The main idea of the second paragraph is that______.
A．a country's wealth depends on many factors
B．the USA is one of the wealthiest countries in the world
C．the Sahara Desert is a very poor region
D．natural resources are an important factor in the wealth or poverty of a country
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