每位患者第一次来院就诊时，不管住院、看急诊或门诊，就要发给一个唯一识别号，即病案号的

一对年轻夫妇和其两岁的孩子做游戏，让孩子把分别写有“One”，“World”，“One”，“Dream”的四张卡片随机排成一行，若卡片从左到右的顺序排成“One  World  One  Dream”，则孩子会得到父母的奖励，那么孩子受到奖励的概率为______．

实验室常用二氧化锰与浓盐酸反应制取氯气，其化学方程式为：MnO₂ + 4HCl(浓)   MnCl₂ + Cl₂↑+ 2X根据上述已配平的化学方程式，可知X的化学式为（ ）

A．H₂

B．H₂O

C．H₂O₂

D．HClO

下列物质中，属于合成高分子化合物的是（　　）

A．有机玻璃

B．天然橡胶

C．棉花

D．羊毛

在下面两段文字中横线处，依次填入最恰当的关联词语。
①进入21世纪，人类______为自己创造了一个非常辉煌的迅猛发展的现代文明，______这个文明业已在20世纪末暴露出很多弊端，遇到了目前新的问题。
②当您发现有人偷税或逃税时，您有权利也有义务对这种行为进行举报。因为他偷税、逃税______是在损害国家利益，______是在损害您的利益，个别人的偷税逃税，实际上增加了他人的负担。

A．已经 而且 既 又
B．即将 而且 不但 也
C．即将 但是 既 又
D．已经 但是 不但 也

阅读理解。

      Each Tuesday afternoon, after the bell rings for the fourth period, Liu becomes a fashion designer. At the

same time, the rest of the students at the High School Attached to Yunnan Normal University in Kunming are

also having classes a little bit different from the usual ones. Some students dance, others create robots, and

still others review films. These are just a few of the other 27 elective (选修的) courses besides Liu's sewing

class that the school began to offer last month.

      "The fashion design class has become the bright point of my week. I learn how to choose colors and

fabrics (织物) as well as sewing and sketching (素描) skills. It's all helping me to realize the dream of

becoming a fashion designer I've had since I was a little girl," Liu said.

      Design is Liu's favorite, but for other students the electives are interesting lessons which relieve (舒缓)

the pressures of schoolwork. Some students, for example, are learning how to play bridge. Chen Xi, 15, is

one of them. She said, "Many people think that playing a card game like this in class is a waste of time. But

in fact, bridge is a very challenging game that helps develop memory and math skills."

1. How often do the students have elective classes? [ ]

A. Once a week

B. Once a month

C. Once a term

D. Once a year

2. How many elective courses had the school offered by last month? [ ]

A. 27

B. 28

C. 26

D. 25

3. Why did the students like to have elective classes?[ ]

A. Because the elective classes are easier.

B. Because they needn't do any homework in the elective classes.

C. Because they can get an opportunity to relieve their pressures.

D. Because they want to be fashion designers in the future.

4. According to the passage many people think _____ in class is a waste of time.[ ]

A. dancing

B. creating robots

C. playing a card game

D. reviewing films