单项选择题

The main cause of pollution is ______.

A．the release of artificial or natural substances into the environment
B．the production of new industrial goods
C．increased amounts of a natural substance
D．our ever-increasing population

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热门试题

单项选择题

It seems that now a country's economy depends much on ______.

A．how well-developed it is electronically
B．whether it is prejudiced against immigrants
C．whether it adopts America's industrial pattern
D．how much control it has over foreign corporations

单项选择题

It could be inferred from the passage that ______.

A．the commercialization of tile Internet prevents its popularization
B．Government was .afraid of' the Internet and digital divide
C．a country should not let foreign corporations run uncontrolled
D．America's Third Wave infrastructure are all invested by itself