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A smile is the universal______(face) expression — it is intended to put people at ease.

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在现状图上只展绘建、构物的平面位置和外部轮廓。()

厂房控制网也可由两条互相平行的主轴线构成,称为主轴线控制网。()

These discoveries proved the______(exist) of a human species who lived in the area between 700 000 and 200 000 years ago.

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