题目内容

点A的X坐标，反映了A点到（）的距离。

A. H面的距离
B. V面的距离
C. W面的距离
D. 原点的距离

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点的投影连线一定垂直于相应的投影轴。

A. 对
B. 错

根据课文内容填空Laughter _______us with other people.

Studies find that we are 30 times more _________to laugh with other people than alone.

Most laughter is about _______friendly with other people.