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Too much stress may lead to __________ (biology) and _________ (psychology) disorders.

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The social phenomenon can be analyzed from ______ (history), ______ (economy) and _________ (politics) points of views.

The paper conducts a ______ (system) and ________ (logic) research on how to enhance college students' language competence.

请归纳出校园中喜鹊、水绵、樟子松、蚊子、小家鼠的共同特征。

细胞工程的应用价值有哪些?

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