井下发生水灾时，人员必须朝有风流通过的上山巷道方向撤退.

Hi, my name is Amy. I am a Grade 7 student, and I would like to tell you something about my class and myself.

There are ten classes in Grade 7.In each class, there are about forty students. I think that my class, Class 4 is the best(最好的).That is because all the students in my class work very hard and the teachers are all very nice to the students. But I am not one of the best students in the class.

I love reading, and I am very good at Chinese and English. I don’t find Maths very interesting, so I am not good at it. I want to work hard at it. My teacher, classmates and my parents would like to help me with my Maths.

小题1:How many classes are there in Grade 7at Amy’s school?

A．Six

B．Seven

C．Nine

D．Ten小题2:How many students are there in Grade 7?

A．About 400.

B．About 500

C．About 300

D．About 600小题3:Why is Amy’s class the best class in Grade 7?

A．Because the teachers are the best.

B．Because the boys work very hard.

C．Because the students are very nice to the students.

D．Because the students work very hard and the teachers are very nice.小题4:What does Amy love doing?

A．Singing

B．Reading

C．Swimming

D．Watching TV小题5:What is Amy not good at?

A．Chinese

B．P.E.

C．English

D．Maths

牙本质中有机物的主要成分是（）

A.糖蛋白

B.氨基多糖

C.胶原蛋白

D.弹性纤维

E.网状纤维

城市道路的线形设计是指路线立体形状及其相关诸因素的综合设计。

中华人民共和国 * * ______。

A．可以单独决定国家重大事务
B．是我国最高国家权力机关的重要组成部分
C．享有最高立法权
D．是全国人民代表大会常委会选举产生的

社会保障卡内有几个应用环境？