平面线形要素的组合与衔接有哪几种？

I am an English girl. My name is Mary. I’m twelve. My dad and mom are English teachers. I have a sister. Her name is Ann and she is twelve years old, too. We are in China now. Ann and I study(学习) in Beijing No. 4 Junior High School. We are in the same grade, but in different classes. Ann has a cat. It looks nice. It has a small mouth and two small ears. It is white. We have friends here. They’re good.

根据短文内容，判断正(T)误(F)。

小题1:Mary is from the U.S.A.

小题2:Ann is in Beijing No. 4 Junior High School.

小题3:Ann and Mary have good friends in China.

小题4:Ann has a black cat.

小题5:They are in the same class.

新中国成立后的一段时间里，许多生活必需品要凭票供应（见下图），即政府对粮食、棉花、食用油等采取统购统销政策。对这一政策的理解，不正确的是

A．保证了人民基本生活物资的需要

B．是在物资比较丰富的条件下实行的

C．缓和了生活必需品的购销矛盾

D．在当时起到了比较积极的作用

罗伯特•约翰斯顿所提出顾客容忍区的三种输出状态是（）。

A.不满意

B.满意

C.非常满意

D.愉悦

为什么禁止上肩搬运工件？