填空题

Some hard plastics______(可以取代金属) in manufacturing machine parts.

【参考答案】

Can be substituted for metals/can replace metals/can be used......

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单项选择题
The passage tells us that in the future ______.
A．children will not be taught in schools
B．no teachers will be needed
C．teachers will be less knowledgeable
D．children will learn life skills at school
填空题
American people began to protest against the government because of the Abu Ghraib scandal.
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