1912年中华民国成立后，南京临时政府将( )改为警察．A．“巡捕"和“巡警"

霍乱病人的严重腓肠肌、腹肌痉挛，最主要的治疗是（）。

A.补氯

B.补钾

C.补钠

D.补钙

E.补镁

补写出下列名篇名句中的空缺部分。

小题1:水击三千里，                         。           《逍遥游》

小题2:                      ， 此亦飞之至也。           《逍遥游》

小题3:若夫乘天地之正，                     。           《逍遥游》

小题4:背负青天，                           。           《逍遥游》

小题5:蜂房水涡，                           。           《阿房宫赋》

小题6:                           ，开妆镜也。           《阿房宫赋》

小题7:                     ，多于机上之工女。           《阿房宫赋》

小题8:后人哀之而不鉴之，                   。           《阿房宫赋》

The surprising experiment I am about to describe proves that air is all around you and that it presses down upon you. Air pressure is a powerful force. When you swim underwater, you can feel water pushing down on your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.

The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now for the experiment！

What you need

•A hard-boiled egg without the shell

•A bottle with a neck slightly smaller than the egg

•A piece of paper

•A match

Method

1） Check that the egg will sit firmly on the neck of the bottle.

2） Tear the paper into strips and put the strips into the bottle.

3） Light the paper by dropping a burning match into the bottle.

4） Quickly sit the egg on the neck of the bottle.

Result

Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.

Why it happened

As the paper burns, it needs oxygen and uses up the oxygen （air） in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down on it.

小题1:Why is there the need to take care when you are doing the experiment?

A．The bottle could break.

B．You need to light the paper with a match.

C．The egg needs to be shelled.

D．The egg has to be perfectly placed on the neck of the bottle.小题2:In the experiment, the burning inside the bottle can___.

A．equalize the air pressure inside and outside

B．make a seal in the neck of the bottle

C．finish up the oxygen inside the bottle

D．produce more oxygen inside the bottle小题3:How did the egg put into the bottle？

A．The oxygen inside the bottle sucked the egg in.

B．It became saft without the shell.

C．The neck of the bottle was wide enough.

D．The outside air pressure forced it into the bottle.小题4:The experiment is carried cut to prove ______.

A．water pushes on your body when you swim underwater.

B．the earth is surrounded by a layer of air called the atmosphere.

C．the pressure of air around us has a powerful force.

D．the air pressure is not equalized around us.

下列有关物质性质的比较顺序中，错误的是（　　）

A．酸性：HClO₄＞H₂SO₄＞H₃PO₄＞H₂SiO₃

B．微粒半径：K⁺＞Na⁺＞Mg²⁺＞Al³⁺

C．热稳定性：HF＜HCl＜HBr＜HI

D．熔点：Li＞Na＞K＞Rb

对组织的机构设置、人员配备、权责划分具有决定性作用的组织要素是（）

A.物财

B.职位

C.目标

D.程序