你知道以下哪种洗涤用品对环境的破坏最小吗？（）A.洗衣粉 B.洁厕灵 C.肥皂 D.

阅读理解。

     In North America, most students go to school by bus. The subway is also widely used in some cities.

In small towns and cities, walking is still popular.

     The yellow school bus is a familiar sight all over North America. It is a very convenient form of

transportation because it takes students right to the entrance to the school. It also gives students opportunity

to chat with their friends. However, the bus is slow and does not always pick up on time.

     The subway is a means of getting around quickly in many cities. However, it is expensive and can be

very crowded during rush hour. Another disadvantage of the subway is that the stops are not so close to the

school, and students often have to walk considerable distance or take a bus from the subway stop to the

school.

     Walking has a number of advantages for those who live reasonable close to school. It's free and it provides

a form of exercise. However, it's no fun if you have a large backpack full of books to carry. It's also

unpleasant if the weather is either too hot or cold or wet.

1. In North America, most students usually go to school by ________.

A. school bus or subway

B. car or bicycle

C. taxi or car

2. For many students, the yellow school bus is convenient but it is ________.

A. too expensive

B. slow and sometimes late

C. crowded and dirty

3. Subways are fast but the stops are often a little bit ________ the school.

A. close to

B. busy for

C. far away from

4. Walking is a good way for the students that live reasonable close to school and it is ________.

A. not convenient

B. bad for health

C. good for health

5. This passage is about ________ in North America.

A. transportation

B. students

C. schools

在结缔组织疾病中，哪种较易侵犯肺部和胸膜()

A．系统性红斑狼疮

B．干燥综合征

C．类风湿关节炎

D．结节性多动脉炎

E．硬皮病

男，60岁。心前区阵发性疼痛1个月，多在夜间发作，与活动无关。每次发作 15分钟，发作时心电图Ⅱ、Ⅲ、aVF导联ST段抬高。首选治疗的药物是

A．硝酸酯类
B．β受体阻断剂
C．钙离子通道阻滞剂
D．洋地黄类
E．乙胺碘呋酮

64，2，27，（），8，，1，1

A．A

B．B

C．C

D．D

已知我国2000－2005年有关资料如下：

要求根据上述资料计算：

“十五”期间年平均人口数是多少？