随堂练习 3I. 阅读理解：A Considered as a continuous body of fluid （流体）,the atmosphere （大气）is another kind of ocean .Yet ,in view of the total amount of rain and snow on land areas in the course of a year ,one of the most amazing water facts is the very small amount of water in the atmosphere at any given time .The volume （体积）of the lower seven miles of the atmosphere ,where weather events take place ,is roughly four times the volume of the worlds oceans .But the atmosphere contains very little water .It is chiefly in the form of vapor（蒸气）,some of which is carried over land by air currents .If all vapor suddenly fell from the air onto the earths surface, it would form a layer only about one inch thick .A heavy rainstorm on a given area may use up only a small percentage of the water from the air mass that passes over .How ,then ,can some land areas receive more than 400 inches of rain per year ?How can several inches of rain fall during a single storm in a few minutes or hours ?The answer is that rainproducing air masses are always moving ,and as the driving air mass moves on ,new damp air takes its place . The basic source of most water vapor is the ocean .Evaporation（蒸发）,vapor transport ,and rainfall make up the continuous movement of water from ocean to atmosphere to land and back to the sea .Rivers return water to the sea .In the underground ,flowing bodies of water send out some water directly into rivers and some directly to the sea .1What might have been discussed in the preceding （在前的）paragraphs ？AThe ocean .BThe earth .CThe rainfall.DThe atmosphere .2It can be inferred from the passage that .Athe atmosphere has a lot of water in it when it goes around Bthe water in the atmosphere is purer than that in the worlds oceansCthe amount of water in the atmosphere is greater than that in the oceans in the worldDthe small amount of water in the atmosphere plays an important part in the rainfall on the earth3Which fact does this passage lead us to believe ？AThe volume of the atmosphere is four times that of the worlds oceansBThe water in the oceans in the main source of rain and snow on land areasCThe atmosphere is mainly made up of the vapor carried over land by air currentsDThe earth cannot support the water in the atmosphere if it falls down onto the earth suddenlyB The Atlantic Ocean ,named for the lost island of Atlantis in very old stories ,has made up for the romantic beginning of its name by becoming the most important business highway in the world ;yet traces（痕迹）of romance are continually mixed with the business of the sea . For instance ,the Spanish adventurers who first sought gold and silver in America frequently found their ships stopped because there was no wind ,usually on the edge of the steady trade winds about 30 degrees north or south latitude（纬度）.A sailing ship could carry only so much water ,and as it lay still under a hot sun for days or weeks ,the severe pains of thirst would make anyone dying or go away forever . The horses were generally the first victims（牺牲品）;they had to be thrown overboard when they died or became mad with thirst .Because the Spanish gentlemen thought highly of their horses ,even believing they had souls after their death ,they suffered bitter regret and believed the ghosts （灵魂）of the proud war horses would so often come to the scene ;and they saw the restless spirits in their dreams and related their dreams to sailors . Whenever the seamen passed that way ,they would see in the waves or clouds images of wild horses bearing down on them ;they began to call the broad belts of calm the “horse latitudes,”the romantic name by which they are known today .4According to the passage ,Atlantis .Aprobably did not exist even long ,long ago Bwas an island named after the ocean in which it was supposed to have existedCwas surely an actual island which had disappeared Dwas the name of an island given by the Spanish adventurers5Today the Atlantic is .Aromantic ,rather than businesslikeBcompletely lacking in romanceCless important to business than in the days of the sailing ships Dmore important to business than in the days of the sailing ships 6The area of “horse latitudes”was dangerous because .Aships could easily sink there Bthere was no wind thereCships were overloaded with horses Dthere were souls of dead horses often making trouble to seamen7Dying horses were probably thrown overboard in order to .Asave waterBlighten the ship Cspare them the serious pains of thirstDspare the men the trouble of caring for them II. 书面表达请你根据下列图画的内容，用英语给21世纪报写一篇短文，叙述你在路上所见的事，并就骑车人的行为简述自己的感想。 注意：1短文须包括图画的所有内容；为使短文连贯，可适当增加细节。2词数：100左右。