平面一般力系简化的结果是主矢和主矩，主矩的计算与简化中心无关。

用方框内所给单词完成对话.

A. really  B. Where  C. How   D. miss  E.  cheerful  F.died

Alice: Mark, I have some photos of my family. This is my grandfather.
Mark : __小题1:____is he now?
Alice: He is doing Taijiquan  in the yard( 院子 ). And that’s my grandmother. She __小题2:_____one year ago.
Mark: Do you still____小题3:____her?
Alice: Yes. She was always____小题4:___.I’ll never forget her. And this is a picture of my father and my mother at Window of the World in Shenzhen. They ___小题5:__like travelling.