单项选择题

In 1989, a(n) ()law was passed by the United Nations to stop people putting waste into sea.

A. national
B. local
C. internet
D. international

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单项选择题
It’s very cold outside. You should put on more clothing to (), otherwise you will catch bad cold.

A. keep it out
B. make it out
C. keep out it
D. keep off it
单项选择题
The price of the portable computers(手提电脑) is still so () that I can’t afford to buy one.

A. high
B. low
C. expensive
D. dear
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