单项选择题

What does the passage mainly talk about

A．The development of home and market economies.
B．The economy of developed nations.
C．The history of art.
D．How to make money.
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单项选择题
The reason why many production processes were taken over by the marketplace was that______.
A．it was a necessary step in the process of industrialization
B．they depended on electricity available only to the market economy
C．it was troublesome to produce such goods in the home
D．the marketplace was more efficient with respect in these processes
单项选择题
Which of the following is NOT true
A．During the past two centuries, 19 species of animals have disappeared in Australia.
B．Life on Earth is about 3.5 million years old.
C．By the end of this century about one million species could become extinct.
D．At least 250 million species of animals and plants have lived on Earth.
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