问答题

But if all of them had worked separately and independently without division of labor, they certainly could not have made twenty pins in a day and not even one.

【参考答案】

但是如果他们分散工作，没有劳动分工，他们肯定不可能一天生产出20个大头针，也许一个也生产不出来。

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A．the new poll about computers and the Internet is helpful
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What language abilities will be improved if advanced students take part in the program? （）Chinese.