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天然水中按其颗粒大小不同可分为()、胶体、溶解物质三类

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氧化 -还原反应的特点是在溶液中氧化剂和()之间发生了电子转移

Decide which maxim of the cooperative principle has been flouted in the following utterances and what implicature can be drawn. (1) A: Can you tell me the secret？ B: But John is there. (2) A: Let s go to the movies. B: I 11 bring the Kleenex. (3) A: Would you drive a Mercedes？ B: I wouldnt drive ANY expensive car.

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Comment on the following statement based on your own experience." Knowing words is the key, to understanding and being understood. The bulk of learning a new language consists of learning new words. Grammatical knowledge does not make for great proficiency in a language. " (Vermeerl992)