程控交换机的话路系统由（）组成。A、模拟终端接口电路 B、数字终端接口电路 C、交换

In every country, there are thousands of people who want to help out. Many join organizations run (管理) by their governments, for example, the Peace Corps in the United States and Voluntary Service Overseas in Britain. Since the powerful (猛烈的) earthquake took place in Sichuan, more than 200 thousand volunteers across China have been helping there! They do all kinds of work or come up with ways to help improve life. Some offer their professional skills for free. Others have no qualifications (资历), but they love to work hard to help.

One of the most famous volunteers in the world was Mother Teresa. She could be the best volunteer because she gave her life to helping the poorest people of Calcutta. She helped the homeless, cared for the sick, gave out food, and became the mother of those without families.

Now more and more teenagers actively look for volunteering opportunities, too. They volunteer because they think it will be fun or they will learn something. They also like the idea of being helpful to others, even if it is just handing out books for the teacher. As they get older, these reasons are still the same, but there are other important reasons for volunteering such as learning on-the-job, getting work experience, and improving their social life.

All volunteers bring joy to the people they help in so many ways. They might read books to the blind, fix up broken homes, find ways to get water for villages. Could you be a volunteer? What kind of volunteer work could you do? There is someone in the world who needs you.

小题1:The Peace Corps is   __   in the United States.

A．a city

B．an organization

C．a volunteer

D．a school小题2:The word those in the passage means   __  .

A．the homeless

B．the sick

C．the poor

D．the kids小题3:What is NOT the reason for teenagers to be volunteers according to the passage?

A．They want to make more friends.

B．They want to be helpful.

C．It helps them get work experience.

D．It can improve their social life.小题4:Which of the following is true according to the passage?

A．Volunteers need qualifications.

B．Volunteers offer their help without any pay.

C．Young kids can’t be volunteers.

D．Some volunteers bring joy to others.小题5:What is the main idea of this passage?

A．The world needs volunteers.

B．Mother Teresa was a great volunteer.

C．Volunteers do all kinds of work.

D．There are different ways of volunteering.

读经纬网图，回答：

（1）写出下列各点的经、纬度．

A：经度______纬度______

B：经度______纬度______

C：经度______纬度______

（2）A、B、C三点中，位于北半球的是______．

位于东半球的是______．

（3）A点在B点的______方向．

下列离子方程式书写不正确的是

A．碳酸氢铵和足量的氢氧化钠溶液反应：NH₄^＋＋OH^－＝NH₃↑＋H₂O

B．含等物质的量的硫酸氢钠与氢氧化钡两溶液混合：

H⁺ + SO₄^2-+Ba²⁺ +OH^- = BaSO₄ ↓+H₂O

C．用稀硝酸浸泡做过银镜反应的试管：3Ag＋4H^＋＋NO₃^－＝3Ag^＋＋NO↑＋2H₂O

D．用两个铜电极电解饱和食盐水：2Cl^—+2H₂O2OH^—+H₂↑+Cl₂↑

在△ABC中，角A、B、C所对的边分别为a、b、c，且b²+c²=a²+bc，则角A的大小为 ______．

下列内容关于色彩情感叙述不正确的选项是( )。

A．黑色象征着严肃和庄重

B．黄色象征着愉快和光明

C．白色象征着纯洁和爱情

D．紫色象征着娇艳和庄重