以上腧穴中，善于治疗气虚病证的是（） A.膻中 B.气海 C.关元 D.肾俞 E.中

     People believe that climbing can do good to health. Where can you learn the skill of climbing then?

If you think that you have to go to the mountains to learn how to climb, you're wrong. Many Americans

are learning to climb in city gyms (体育馆). Here, people are learning on special climbing walls. The

climbing wall goes straight up and has small holding places for hands and feet.

     How do people climb the wall? To climb, you need special shoes and a harness(保护带) around

your chest to hold you. There are ropes (绳索)tied to your harness. The ropes hold you in place so

that you don't fall. A beginner's wall is usually about 15 feet high, and you climb straight up. There are

small pieces of metal that stick out for you to stand on and hold on to. Sometimes it's easy to see the

new piece of metal. Sometimes, it's not. The most difficult part is to control your fear. It's normal for

humans to be afraid of falling, so it's difficult not to feel fear. But when you move away from the wall,

the harness and the ropes hold you, and you begin to feel safe. You move slowly until you reach the

top.

     Climbing attracts people because it's good exercise for almost everyone. You use your whole body,

especially your arms and legs. This sport gives your body a complete workout. When you climb, both

your mind and your body can become stronger.

1. What can we infer from the passage?

A. People are fairly interested in climbing nowadays.

B. It is impossible to build up one's body by climbing.

C. People can only learn the skill of climbing outdoors.

D. It is always easy to see holding places in climbing.

2. The most difficult thing to do in wall climbing is _______.

A. to tie ropes to your harness

B. to control your fear

C. to move away from the wall

D. to climb straight up

3. The word "workout" underlined in the last paragraph most probably means _______.

A. settlement

B. exercise

C. excitement

D. tiredness

4. Why does the author write this passage?

A. To tell people where to find gyms.

B. To prove the basic need for climbing.

C. To encourage people to climb mountains.

D. Introduce the sport of wall climbing

如图所示，一束带电粒子（不计重力）垂直电场方向进入偏转电场，试讨论在以下情况中，粒子应具有什么条件，才能得到相同的偏转距离y和偏转角θ，已知粒子的电荷量为q，质量为m，极板长度l，间距d，电势差为U，l、d、U为定值，q、m为不定值。

(1)以相同的初速度v₀进入偏转电场；

(2)以相同的初动能E_k0进入偏转电场；

(3)先由同一电场直线加速后再进入偏转电场。

个体户经营难，除了规定、制度、税负等外部因素外，创业成本过高，管理不善等是其重要的内容。这启示我们要振兴和壮大个体经济就必须 (   )

A．对个体经济实行完全的免税政策

B．进一步加大财政对个体经济的倾斜力度

C．依靠技术、科学管理，转变发展方式

D．不断扩大个体经济的规模，加大引进外资的力度

以下哪种途径不是提高植物的抗性的正确途径（）。

A．低温锻炼可提高植物抗冷性

B．植物适应盐胁迫的关键问题是排盐

C．增施氮肥能提高植物的抗性

D．合理使用生长延缓剂与抗蒸腾剂可提高作物抗旱性

在某工厂研究饮酒与糖尿病关系的队列研究中，发现饮酒者糖尿病的发病率是12.0％，不饮酒者糖尿病的发病率为3.0％，该工厂工人的糖尿病的发病率是5.0％。根据此资料：

归因危险度为（）

A.2.0％

B.7.0％

C.8.0％

D.9.0％

E.无法计算