短路保护包括（）和（）。

在学习压强的知识时，小聪想利用老师准备的如图所示的器材：①用钉子做腿的小桌 ②海绵 ③砝码 ④木板 ⑤盛有适量水的矿泉水瓶 ⑥装有沙的容器等器材进行探究“压力的作用效果与哪些因素有关”实验．

（1）实验时，为了探究压力作用效果与压力大小的关系，你选择图中实验器材是　          　（填序号）；通过观察　                             　来比较压力作用效果．

（2）要探究压力的作用效果与受力面积的关系．

小明与小华的意见产生了分歧

小明认为：在压力一定时，受力面积越小，压力产生的作用效果越明显．

小华认为：在压力一定时，受力面积越大，压力产生的作用效果越明显．

他们选择图中①③⑥等三个器材进行相关实验．请你写出实验步骤．

第一：　                                                                           　；

第二；　                                                                           　．

通过比较观察的实验现象小华认为小明的观点是正确的．

如图所示正常胸部X线影像图像上，该英文字母所代表的肺段为()

A．H代表内基底段

B．H代表前基底段

C．H代表外基底段

D．H代表后基底段

E．H代表背段

阅读理解。

     The internet will open up new vistas (前景), create the global village-you can make new friends all around

the world. That, at least, is what it promised us. The difficulty is that it did not take the human mind into

account. The reality is that we cannot keep relationships with more than a limited number of people. No matter

how hard the internet tries to put you in communication, its best efforts will be defeated by your mind.

     The problem is twofold (双重的). First, there is a limit on the number of people we can hold in mind and

have a meaningful relationship with. That number is about 150 and is set by the size of our brain. Second, the

quality of your relationships depends on the amount of time you invest (投入) in them. We invest a lot in a

small number of people and then distribute what's left among as many others as we can. The problem is that

if we invest little time in a person, our engagement with that person will decline (减弱) until eventually it dies

into "someone I once knew".

     This is not, of course, to say that the internet doesn't serve a socially valuable function. Of course it does.

But the question is not that it allows you to increase the size of your social circle to include the rest of the

world, but that you can keep your relationships with your existing friends going even though you have to move

to the other side of the world.

     In one sense, that's a good thing. But it also has a disadvantage. If you continue to invest in your old friends

even though you can no longer see then, then certainly you aren't using your time to make new friends where

you now live. And I suspect that probably isn't the best use of your time. Meaningful relationships are about

being able to communicate with each other, face to face. The internet will slow down the rate with which

relationships end, but it won't stop that happening eventually.

1. What is stressed in the first paragraph?

A. The present situation of the internet.

B. The difficulty in communication on the internet.

C. The socially valuable function of the internet.

D. The role of the human mind in the internet communication.

2. The underlined word "engagement" in the second paragraph probably means "_____".

A. appointment

B. connection

C. interview

D. agreement

3. According to the passage, the author holds the view that _____.

A. the internet fails to play so valuable a role in communication as it promised

B. the internet determines the quality of social relationships

C. the internet greatly increases the size of social circles

D. the internet communication is no less effective than the face-to-face talk

4. What is the author's attitude towards the use of the internet to strengthen relationships?

A. He is uncertain about it.

B. He is hopeful of it.

C. He approves of it.

D. He doubts it.

关于PCR技术，不正确的描述是（）。

A.是一种有细胞的分子克隆技术

B.是一种DNA扩增技术

C.具有快速、灵敏和特异性强等特点

D.可用于病毒DNA片段的检测

E.也可用于细菌等微生物的DNA片段检测

心理记账是人们在心理上对结果进行分类、编码、估价和预算等的过程。消费者在决策时可能根据不同的任务进行相应的心理记账。　　根据上述定义，下列不属于典型心理记账的是：

A．损失10元钱给人心理带来的痛苦要比获得10元奖金带来的高兴更强烈

B．王某出差常选星级酒店，因为它比旅馆更可能提供免费网络和自助早餐

C．相比丢了10元钱的人，丢了电影票的人更不可能会挣钱买票去看电影

D．工会发放福利时，不再发实物而改发购物卡以使职工有更多的自由选择