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It is necessary to introduce the history of the place that you are writing.（）

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______is a vital energy that flows through the body, performing multiple functions in maintaining health（）

A. Blood
B. Qi
C. Liquid
D. Water

The synonym of “pandemic” is “epidemic”.（）

_stands for the world health organization.（）

A. WTO
B. WHO
C. AIDS
D. UN

纯净油液的体积模量较小，故可被压缩（）