影响需求和供给的因素分别是什么？

阅读理解。

     One day, a teacher was giving a speech to his students. He held up (举起) a glass of water and asked the

class, "How heavy do you think this glass of water is?"

     The students' answers ranged from 20 g to 500 g? "It does not matter on the weight itself. It depends on

how long you hold it. If I hold it for a minute, it is OK. If I hold it for an hour, I will have an ache in my right

arm. If I hold it for a day, you will have to call an ambulance (救护车). It is exactly the same weight, but the

longer I hold it, the heavier it becomes."

     If we carry our burdens (负担) all the time, sooner or later, we will not be able to carry on, the burden

becoming increasingly heavier.

     "What you have to do is to put the glass down, rest for a while before holding it up again."

     We have to put down the burden sometimes, so that we can be refreshed and are able to carry on.

     So before you return home from work tonight, put the burden of work down. Don't carry it back home.

You can pick it up tomorrow.

     Whatever burdens you are having now on your shoulders, let it down for a moment if you can.

1. The teacher brought a glass of water to the class because _____. 

A. he was very thirsty

B. his arms were strong

C. it was a good example

2. "A glass of water" in this passage referred to (指) _____.

A. knowledge

B. the burden

C. the time 

3. According to the teacher, you may feel _____ if you put down the burden sometimes.

A. more energetic

B. much heavier

C. more stressed out

4. This was a lesson about _____.

A. how to relax oneself in life

B. how to solve a physics problem

C. how to keep fit by drinking water

5. Which of the following statements is TRUE according to the passage?

A. You could become heavier and heavier if you held a glass of water in your hand.

B. All the students in the class knew what the weight of the glass of water exactly was.

C. The teacher had a good way of making his lesson clear and easy to be understood

治外感风寒夹湿的中成药是（）

A.午时茶颗粒

B.正柴胡饮颗粒

C.桑菊感冒片

D.九味羌活丸

E.银翘解毒颗粒

液压支柱式推力轴承有一定的自调能力，可不需要进行严格的推力瓦受力调整。

以下有关测试活动的描述中，错误的是

A) 测试策划中的活动是确定测试范围、测试环境和制定测试计划
B) 测试用例设计是测试设计与实现的主要内容
C) 测试执行中可随时修订测试计划
D) 测试总结的目的是对测试结果进行分析，以确定软件产品质量的当前状态

没有信号发送时，高能力者向低能力者补贴的情况存在。