收取物业服务费的工作属于( )的工作内容之一。A．物业的接管验收 B．客户管理服务

铁和碳以化合物形式组成的组织称为莱氏体。 ( )

阅读理解。

     You may know the song Happy Birthday very well. But do you know about its writer? It was written

by an  American girl. And she became very rich after that.

      When she was a child, she was poor. Once, she was invited to her friend's birthday party. She was

pleased but sad because she didn't have enough money to buy a gift for her. "The party is coming soon,

but now I have little money." Tears ran down her face.

     Later that night she was in bed, thinking about the gift when the door opened and her grandma came in.

"What happened?" her grandma asked. Hearing the girl's story, she said, "Don't worry. I think I can help

you. How about singing a song!" They sang and sang. Suddenly she woke up. It was a dream! She decided

to write it down at once and sing it to her friends at the party.

     When she sang the song at the party the next day, her friends were very happy. "How wonderfully you

sing! We haven't heard such a beautiful song before. Thank you for giving me the special gift." Said her

friend. And they learnt to sing it together. Later, the girl became well-known in America.

1. The writer of the song Happy Birthday is _____. [ ]

A. an American girl

B. an American girl's grandma

C. an American boy

D. an American girl's friend

2. The girl was sad because _____.[ ]

A. she didn't want to go to the party

B. she wouldn't be busy that day

C. she didn't have enough money to buy a gift

D. her friends didn't invite her

3. What gift did she give her friend?  [ ]

A. A flower

B. A toy

C. An interesting book.

D. A song. 

4. What did her friends think of the song? It was _____.[ ]

A. boring

B. beautiful

C. exciting

D. interesting

5. Which of the following is TRUE? [ ]

A. The girl was still poor after writing the song.

B. The girl sang the song with her grandma in her dream.

C. The girl's friends heard the song before.

D. The girl became famous because of the song.

在面向对象设计中，对象有很多基本特点，其中“从外面看只能看到对象的外部特性，而对象的内部对外是不可见的。”这一性质指的是对象的

A．分类性

B．标识惟一性

C．多态性

D．封装性

某石灰厂新到一批石灰石，其中含有杂质二氧化硅（二氧化硅不溶于水，不溶于盐酸，高温不分解）。为测定石灰石样品的纯度，某化学研究性学习小组的同学分成三组实验，测得数据如表：

（1）在空格中填写数据

（2）该实验中，第                        （填数字）组同学的实验中，稀盐酸一定反应完全；第三组实验中， __________一定有剩余。

（3）求出该石灰石样品的纯度____________。

Windows 98提供了多种系统工具便于用户管理和维护计算机系统，提高计算机的运行效率。其中，可用于查看各种系统资源利用状态和目前已加载的各类驱动程序(如IRQ资源的使用情况、已加载的MS-DOS驱动程序等)的系统工具是 ______。