合成树脂胶又分为（）等。A、酚醛树脂胶 B、尿醛树脂胶 C、聚醋酸乙烯树脂胶 D、乙烯树脂

阅读理解。

     Jean is a bright young woman who comes from a rich and famous family. She goes to a good university and has everything that money can buy. Well, almost everything. (1)The problem is that the people in

Jean’s family are so busy that they can hardly find time to be with her. In fact, Jean is quite lonely.

     So Jean spends a lot of time on her QQ. She likes being anonymous(匿名), talking to people who do

not know about her famous family and her rich life. She uses the name Linda on QQ and has made a

lot of friends who she keeps in touch with quite often.

     Last year Jean made a very special friend on QQ. His name was David and lived in San Francisco.

David was full of stories and jokes. He and Jean had a common interest in rock music and modern dance. ( 2) So it always took them hours to talk happily on QQ and sometimes they even forgot their time. Of

course, they wanted to know more about each other. David sent a picture of himself. He was a tall, good-

looking young man with a big, happy smile. As time went by, they became good friends and often sent

cards and small things to each other.

     When Jean’s father told her that he was going on a business trip to San Francisco, she asked him to

let her go with him so that she could give David a surprise for his birthday. She would take him the latest

DVD of their favorite rock singer. But when she knocked on David’s door in San Francisco, she found

that her special friend was a twelve-year-old boy named Jim! 

根据短文内容简要回答下列问题：

1. Why did Jean think David, his friend on QQ, was special?

____________________________________________________________________________

2. What will Jean’s QQ friend’s real name and age?

____________________________________________________________________________

将短文中划线的两个句子译成汉语。

3.____________________________________________________________________________

4.____________________________________________________________________________

请给短文拟一个适当的标题。

5. _________________________________________________________________________

如图所示，A、B是两个摩擦传动轮，两轮半径大小关系为R_A=2R_B，则两轮边缘上的（　　）

A．角速度之比ω_A：ω_B=2：1

B．周期之比T_A：T_B=1：2

C．转速之比n_A：n_B=1：2

D．向心加速度之比a_A：a_B=2：1

玉米种子百粒重为（）g左右

火电工程包括主厂房建筑、烟囱、( )、机组安装、锅炉安装、汽轮发电机安装、升压站、环保工程、附属工程等工程项目。

A．医疗器械
B．送变电工程
C．冷却塔
D．天然气储库

平行度表示符号为──