单项选择题

According to the author, a nation's wealth depends upon______.

A．its standard of living
B．its money
C．its ability to provide goods and services
D．its ability to provide and transport and entertain
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单项选择题
The main idea of the second paragraph is that______.
A．the USA is one of the richest countries in the world
B．the Sahara Desert is a very poor region
C．a country's wealth depends on many factors
D．natural resources are an important factor in the wealth or poverty of a country
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