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明白的,意识到的 a. ___________

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Dear Uncle, It’s quite some time since we last ____ （） of your great effort. Yours, Li Hua

The harmful effects of smoking is more than you can imagine. When I was young, I didn’t know much abThe harmful effects of smoking is more than you can imagine. When I was young, I didn’t know much about the harmful effects of smoking. I didn’t know, for example, that it could do terrible （） ______to quit smoking.

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多种栅栏因子对食品中微生物生长繁殖的抑制作用,不仅仅是这些因子单独效应的简单叠加,而是相乘作用,这种效应称称为（）