警冲标是标志的一种（）。A、线路 B、道岔 C、车辆 D、信号

It’ s Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They’ re singing and dancing. What are those women doing? They are drinking tea. Look at the woman in a blue coat.  Who’ s she?  She’ s my mother. She is talking to Edward. Edward is her student. He is a good student. He studies hard .  He’ s good at all the subjects.  And he’ s  friendly to all his teachers and his friends.

小题1:The boys are__________ .

A．singing

B．playing basketball

C．dancing

D．drinking小题2:My mother is___________    .

A．a teacher

B．an office

C．a doctor

D．a woman小题3:Edward is in   __________.

A．my home

B．the classroom

C．the zoo

D．the park小题4:---- Who’ s under a big tree? -----          .

A．Some people.

B．Some women.

C．Some girls.

D．Some boys.小题5:--- - What color is my mother’ s coat?------It’s            .

A．blue

B．white

C．red

D．yellow

出境的交通工具和人员，必须在最后离开的国境口岸接受检疫。 ( )

需求的价格弹性是指在其它条件不变时以下哪一组的变动率之比：（）

A、需求变动和价格变动

B、需求量变动和产品数量变动

C、需求变动和产品数量变动

D、需求量变动和价格变动

主蒸汽管道的检修内容有哪些？

肉芽肿