服务监督是企业对客户经理和电话订货员等客服人员日常服务执行情况的监测。它的直接对象是

小明今年10岁了，两岁时父亲因车祸去世了，他和妈妈相依为命。后来妈妈再婚，小明又有了一个疼爱他的爸爸。小明、妈妈和继父组成的家庭是[ ]

A．联合家庭

B．核心家庭

C．主干家庭

D．单亲家庭

实验室制取二氧化碳时，不需使用的仪器是  　

A．试管

B．酒精灯

C．单孔胶塞

D．玻璃导管

完成对话.

A: Let's __1__ to see the pandas.

B: OK. __2__are they?

A: Over there, __3__ to the koala bears.

B: Wow! They are really cute. Where __4__ these pandas from?

A: They're from __5__. That's Lingling, and that's Mingming.

B: Look. The koalas aren't very interesting today.

    They __6__ just sleeping. Do you want __7__ see the penguins?

A: Yes! Penguins are my favorite __8__.

B: Penguins? Really? Why?

A: I __9__ know. They're just so funny.

B: Well, my favorite animal is the lion. Lions are scary, __10__ they're beautiful.

The _______ of the U.S. is now .  [ ]

A. president   

B. queen    

C. king      

D. flag

甲、乙、丙、丁四个人的职业分别是教师、医生、律师、警察，已知：①教师不知道甲的职业；②医生曾给乙治过病；③律师是丙的法律顾问（经常见面）；④丁不是律师；⑤乙和丙从未见过面，请问：甲、乙、丙的职业依次是什么？