写下列物质的分子式：硫化氢、二氧化硫、甲烷、二硫化碳、羰基硫

阅读短文，选择最佳答案。

      One day an old woman wants to see her son in Paris. When she goes to the small station, she forgets

the time the train is coming and leaving. She looks around and she sees a boy playing with a toy pistol(手枪) nearby. She comes up to him and asks for help. The boy doesn't say a word. He only points to her

with his pistol, says "/ tu: tu:tu: tu: tu: tu: /", then he runs away quickly. The old woman is very angry. She

doesn't know why the boy plays such a joke with(同某人开玩笑) her. The train comes. She gets on the

train. When the train starts, she suddenly smiles: How clever the boy is! He tells her the time in that way!

1. The old woman goes to the small station_______

A. to play

B. to see her son in Paris

C. to take a train to Paris

D. to see her daughter in Paris

2. —What is the boy doing?

    —He_______.

A. plays with a pistol

B. playing with a toy

C. is watching a train nearby

D. is playing with a toy pistol

3. Does the boy answer the woman's question?

A. No, he isn't.

B. Yes, he does.

C. No, he doesn't.

D. Yes, he don't.

4. The boy is a _______boy.

A. cleverB. foolish

C. sad D. happy

5. When does the train stay at the station?

A. 1:40-2:20 am.

B. 1:58-2:02 pm.

C. 2:02-1:58 pm.

D.20:02-21:08

下列财务可行性评价指标中，（）没有考虑资金的时间价值。

A.平均报酬率

B.内部报酬率

C.净现值

D.获利指数

Everyone wants to be a friend of _______________ is considerate and shares the same interests.

A．anyone

B．whomever

C．whoever

D．no matter who

建筑物综合布线系统中的垂直子系统是指______。

A．由终端到信息插座之间的连线系统
B．楼层接线间的配线架和线缆系统
C．各楼层设备之间的互连系统
D．连接各个建筑物的通信系统

属于臂前群的肌是（）

A．肱二头肌

B．肱三头肌

C．背阔肌

D．咬肌