2010年中石化职称英语考试阅读理解部分.doc

2010年中石化职称英语考试阅读理解部分 Passage 1 Just as man has found great uses for the materials, which he can dig up from the ground, so, too, he has found important use for the gases, which he can obtain from the air. Oxygen and nitrogen can be made from other materials, but they are usually obtained from the air because air is so plentiful. Some of the other gases, such as argon, can only be obtained from the air. There is so little carbon dioxide in the air that it is better to obtain it in other ways. The problem, of course, is to find q quick and useful way of separating the gases in the air. Let us read how this is done. We remember how air can be made into a liquid. If the liquid is warmed again, It boils and turns back into a gas. Now oxygen does not boil away from liquid air so easily as nitrogen. By careful arrangement of the boiling, it is possible to make the nitrogen turn back into a gas and leave the liquid oxygen behind. The oxygen can be turned into a gas later. In This way the oxygen and nitrogen are separated. The other gases, such as argon, can also be obtained separately by very careful arrangement of the boiling. Questions. Why people usually obtain oxygen and nitrogen from the air? What happens if the liquid is warmed again? Does nitrogen boil easily than oxygen does? Can the nitrogen turn back into a gas? How are oxygen and nitrogen separated? Passage 1 l)Because air is plentiful. 2)It boils and turns hack into a gas. 3)Yes, it does. 4) Yes, it can. 5)Make the nitrogen turn back into a gas and leave the liquid oxygen behind. Passage 2 Scientists call the process of water spreading over a surface wetting. But water doesnt always do a good job of wetting a surface. Youve probably noticed this when looking at the surface of a waxed car after a rain. The water sits on the car in tiny beads. Thats because the water molecules are strongly attracted to one another. They tend to bunch together which makes them form beads. Ho