—WhatdoesPM2.5mean?—Itsaprofes

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—What does PM2.5 mean?
—It's a professional ________ indicating the condition of air pollution.

A．term	B．item
C．number	D．mark

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The boy made the same mistakes , which, of course, made his parents very angry.

A．more or less	B．over and over again
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A．difference

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相关知识点

名词+of 表示数量

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