填空题

I recognized Peter although I（）(see) him for 10 years.

【参考答案】

hadn’t seen
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填空题
It is no use（）(try) to deceive me.
单项选择题
In the last sentence scientists can only point out some of the potential impacts of the decrease of the ozone layer, the protective layer in the atmosphere that shields the earth from the sun’s harmful rays. The word shield means（）

A．cloak
B．guard
C．defend
D．protect
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