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My favorite dish is sweet and sour pork.（）
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用系统命名法命名下列化合物用系统命名法命名下列化合物
There are two levels of web portals identified in the passage: information and communication.There are two levels of web portals identified in the passage: information and communication.
Homonymy refers to the phenomenon that words having different meanings have the same form, i.e. different words are identical in sound or spelling, or in both.（）
There are many words that have more than one p____There are many words that have more than one p______（）.
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