单项选择题

Questions 17-20 are based on a monologue about the growth of Detroit, a large industrial city in America. You now have 20 seconds to read Questions 17-20. What is the main topic of the talk

A．The growth of Detroit as an industrial city.
B．Detroit, the fifth largest city in the U. S. A.
C．The geographical advantages of Detroit.
D．The car industry in the U. S. A.

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单项选择题

A．whyB．whereC．whoD．which

A．why
B．where
C．who
D．which

单项选择题

Why don’t developing countries have strict pollution controls

A．Because the new industries they want to attract do not cause much pollution.
B．Because pollution is not a serious problem for developing countries.
C．Because they don’t realize that the balance of nature will be disturbed by some pollutants.
D．Because if they put strict control on industry, fewer companies would build new plants in developing countries.

Questions 17-20 are based on a monologue about the growth of Detroit, a large industrial city in America. You now have 20 seconds to read Questions 17-20. What is the main topic of the talk 您的浏览器不支持 audio 元素。

Questions 17-20 are based on a monologue about the growth of Detroit, a large industrial city in America. You now have 20 seconds to read Questions 17-20. What is the main topic of the talk