银行债券柜台交易为商业银行带来现金流。（）

阅读理解。

     There are many advantages of becoming a professional musician. The biggest advantage is being able to

do something you love. You will have the chance to travel to many different places and meet a lot of different

people. That will open up your eyes.

     However, there are also disadvantages of being a professional musician. One of the biggest disadvantages

for most musicians is that they don't always have enough money. Most of the time, you will be looking for

jobs. Sometimes you won't be able to find a good job. Another disadvantage is the place you live in. If you

want to be a musician, you usually have to move to an area that has a lot of jobs, such as New York City.

The cost of living in these areas is usually very high. The third disadvantage is that you can't have a stable

family life. Different jobs will take a musician to different places, so most musicians are unable to have a

regular family.

1. The advantages of being a professional musician include all the following EXCEPT _______.

A. making a lot of money all the time

B. traveling to many different places

C. meeting a lot of different people

2. Which is NOT a disadvantage of being a professional musician?

A. Not always having enough money.

B. Being unable to have a stable family life.

C. Having the chance to meet many different people.

3. What does the underlined word"stable" mean in Chinese?

A. 幸福的

B. 稳定的

C. 健康的

4. Which of the following is TRUE according to the passage?

A. The biggest advantage of being a musician is being able to live in big cities.

B. Most musicians are unable to have a regular family life because they enjoy traveling.

C. It's difficult for some musicians to find a good job sometimes.

5. The author mainly tells us _______  in the passage.

A. becoming a professional musician can also have problems

B. why people want to become professional musicians

C. not to become professional musicians

试比较长城和大运河对中国历史的影响。

___________________________________________________________________________________________

在直流控制保护系统中，CAN总线主要用于传输系统状态和控制指令，种类有（）。

A.CAN1

B.CAN2

C.CAN3

D.CAN4

甲、乙、丙、丁是初中化学常见的化合物，甲（甲是相对分子质量为100，难溶于水）和乙（乙是气体，可作气体肥料）中含有碳元素，丙能做干燥剂．它们之间有如图所示的转化关系（部分物质和反应条件已略去）．请根据所学化学知识回答：

（1）甲的化学式为　                   　；

（2）丙转化为丁的化学方程式为　                        　．

（3）写出丁在生产或生活中的一种用途是　                   　．

社会主义生产关系的基础(社会主义制度区别在于资本主义制度的根本标志)是

A．生产资料的公有制

B．按劳分配制度

C．社会的基本矛盾

D．社会的政治制度