单项选择题

The main idea of the second paragraph is that ______.

A．a country's wealth depends on many factors
B．the US is one of the wealthiest countries in the world
C．the Sahara Desert is a very poor region
D．natural resources is an important factor in the wealth or poverty of a country
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单项选择题
The standard of living in a country is determined by ______.
A．its goods and service
B．the type of wealth produced
C．how well it can create wealth
D．what an ordinary person can share
单项选择题
According to the passage, what plays an equally important role in determining a country's standard of living
A．Farm products.
B．Industrial goods.
C．Foodstuffs.
D．Export ＆ import.
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