在放射免疫分析(RIA)这一反应系统中 A．只须固定标记抗原量 B．标记的抗体是过量

服务项目是指一个组织以项目方式提供的（）活动。

A．劳务

B．工程建设

C．生产制造

D．货物买卖

葡聚糖

已知氨可以与灼热的氧化铜反应得到氮气和金属铜，用示意图中的装置可以实现该反应。

回答下列问题：

（1）A中加入的物质是___________________， 发生反应的化学方程式是______________________。

（2）B中加入的物质是___________________，其作用是_________________________。

（3）实验时在C中观察到的现象是____________________；发生反应的化学方程式是_______________。

（4）实验时在D中观察到的现象是_________________________， D中收集到的物质是_____________，检验该物质的方法和现象是__________________________________。

Without the atmosphere there would be no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the bottom of a great ocean of air. It is invisible, but we can feel it when it moves. There are miles of air above us, pressing down with great weight on the earth and everything on it. Because air presses down on us from all directions at the same time, and because we are able to bear (忍受) this weight, we do not seem to feel it. But scientists have proved that air has this weight, and that anything that has weight creates(产生) a force called pressure. As changes in air pressure take place, they, make air move.

Air is a gas that expands(膨胀) when heated, gets lighter, and moves upward. When air is cooled, it gets heavier, sinks close to the earth's surface, and flows like water in a great river. As warn air rises, cold air rushes in to take its place. 'Thus winds originate (起源). The winds that blow high above us are caused by the warmer air running away from colder air. The wind we feel near the earth's surface is the heavy colder air trying hard to catch the warmer air. Changes in temperature cause the air to move. And of course there are many changes, so air movements are taking place practically all the time.

小题1:The first paragraph mainly tells us the causes of

A．why we don't feel air

B．why atmosphere is important to us

C．why there is air surrounding us

D．why there is air pressure小题2:Air moves under such conditions that

A．there is air pressure

B．the air is heavy

C．air pressure doesn't remain the same all the time

D．air comes up and down小题3:Which of the following pictures best tells the movements of warm air and cold air?

小题4:According to the passage, in same areas if farmers who grow grapes (葡萄) light fires in the early morning, that is because the farmers want to________________．

A．drive away warm air

B．prevent cold air from coming to harm their plants

C．cause more wind

D．stop warm air running away

试分析弗里德曼的货币需求理论对通货膨胀根本原因所持的观点及其政策含义。