题目内容

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

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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？

举例说明生态系统主要的组成成分。