以下所给出的现象中，物体运动状态不发生改变的是 [ ] A．原来静止的火车开始出

There is a photo on Becky’s desk. It is a picture of her family. There are four people in it.

The man is her father. He is thirty-eight. He can speak Chinese. There is a woman behind Becky. She is Becky’s mother. She is thirty-seven. She can’t speak Chinese, but she speaks English. They’re teachers. They work in a school. There is a boy in the picture, too. He is Becky’s brother. His name is Jack. He is twelve. He can skate（滑冰） and ride a bike. He has an American friend. Her name is Betty. Becky and her brother are in the same school, but they aren’t in the same grade. They look like their mother. They are English. It’s a big family.

根据短文内容，选择最佳答案。

小题1:____ can speak Chinese.

A．Becky’s father

B．Becky’s mother

C．Becky’s brother

D．Becky’s sister小题2:Becky’s mother is _________.

A．38

B．37

C．35

D．36小题3:Jack’s friend is ____.

A．American

B．Japanese

C．English

D．Chinese小题4:Becky and her brother are ____.

A．in the same school but not the same class

B．in the same school and the same grade

C．in the same school and the same class

D．in the same school but not the same grade小题5:Becky and Jack look like ____

A．their parents

B．their mother

C．their father

D．their son

房间隔缺损

A．胸骨左缘第2肋间可闻及Ⅳ级连续性机器样杂音
B．胸骨左缘3～4肋间可闻及Ⅳ级左右收缩期杂音
C．胸骨左缘2～4肋间可闻及Ⅰ、Ⅱ级左右收缩期喷射音
D．胸骨左缘2-3肋间可闻及Ⅲ级收缩期喷射音，肺动脉瓣区第二音亢进固定性分裂
E．心尖部可闻及Ⅱ级收缩期杂音

关于儿茶酚胺的叙述中，哪些是正确的（）

A.儿茶酚胺包括肾上腺素，去甲肾上腺素和多巴胺

B.异丙肾上腺素主要兴奋心肌β₁受体，因而是心肺复苏主要药物

C.麻黄碱兼有β₁和α受体作用

D.多巴胺主要为β₁受体兴奋药，对小受体也有直接兴奋作用

E.肾上腺素兼有β₁和β₂-受体兴奋作用，在心肺复苏中最主要的作用是β₁受体作用

班主任工作是一项复杂的（）劳动。

A.脑力

B.经验

C.专业

D.管理

目前常采用的基坑围护结构主要有（）。

A.土钉墙

B.地下连续墙

C.SMW工法桩

D.钢板桩