单项选择题

The main cause of pollution is（）

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

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热门试题

单项选择题

Why did the man fasten the end of the rope before he climbed up the ladder（）

A．He was afraid that someone would steal his box.
B．Because he wanted to climb up along the rope.
C．He fastened the end of the rope in order to keep the box unmoved.
D．Because he wanted to prevent the box from coming down.

单项选择题

Which of the following is not mentioned as the reason of young pedple’s drinking and usingdrugs in the passage（）

A．The selling of alcohol and drugs,
B．Pressure from their parents and relatives.
C．Curiosity.
D．Their eagerness to experience what ,is not permissible to them.