（）人以上的公共环境应该有应急照明。 A.500 B.1000 C.2000 D.5

Dear friends,

My name is Tony. I am English. I am thirteen years old this year. I am tall, and I am good at playing football. I am in Grade Seven. There are thirty boys and twenty girls in my class. We are learning Chinese in our school. Our Chinese teacher is Mr. Wu. He is a little short, but he is very strong. He is very nice to us. I have some good friends in my class. Tom is a tall boy and has short black hair. He is good at playing football, too. Alice is short and she loves wearing red dresses. She is good at English. Shelly has long hair. She can speak Japanese and she likes running. We all study hard.

What about your school and your friend?  Please write soon.

Yours,

Tony

小题1:Which country is Tony from?

A．America.

B．England.

C．China.

D．Japan.小题2:Who is Mr. Wu?

A．He is Tony’s English teacher.

B．He is Tony’s father.

C．He is Tony’s friend.

D．He is Tony’s Chinese teacher.小题3:How many students are there in Tony’s class?

A．30

B．20

C．50

D．52小题4:Who likes running?

A．Tom

B．Alice

C．Shelly

D．Mr Wu小题5:Who writes this letter?

A．Tony

B．Tom

C．Shelly

D．We don’t know

若三角形底边长为（6a+4b），高为（4b-6a），则它的面积是（　　）

A．16b²-3ba²

B．36a²-16b²

C．8b²-18a²

D．18a²-8b²

（）的民用扩建的民用建筑设计前应进行工程所在城市区域土壤中氡浓度或土壤表面氡析出率调查，并提交相应的调查报告。

A、新建

B、改建

C、扩建

D、重建

以下不属于模锻（同自由锻相比）的优点的是（）。

A.锻件的形状简单，尺寸精度高，表面粗糙度低

B.机械加工余量小，材料利用率高

C.可使金属流线分布更为合理，提高使用寿命

D.生产率高，锻件成本低

买来蘑菇10 kg，含水量为90%，晾晒一会儿后，含水量为87.5%．

(1)每小时蒸发1kg的水分，晾晒了2 h；

(2)每小时蒸发kg的水分，晾晒了2 h。