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1、写作综合练(三)1Tom的父母来中国工作，于是Tom也跟随他们来中国学习。这样的外国学生在中国的学校里越来越多，他们急于了解中国文化和生活习俗，对一切都很好奇。一天，Tom在网上看到下面的连环画，不理解，通过电子邮件发给我，让我给他解释一下。词数：不少于120个。 【2】“Marginal” lands might have low quality soilOr they might be on a hillside that rises sharplyOr they might be in an area that gets limited rainfallIn any case，they
2、are the last to be planted under good conditions and the first to be avoided under bad conditionsBut there are uses for marginal landsMost often they are used as grasslands for cattle，sheep or goatsA farmer might use native grass or nonnative seedsEither way，it is important to establish good ground
3、cover to avoid the loss of soil through erosionForage crops like clover and alfalfa could be plantedThese members of the legume family provide high protein food for grazing animalsThey also improve the quality of the soilMost plants use up nitrogenLegumes put nitrogen back into the soilForage crops
4、also help reduce erosion of the soilBut using marginal lands for grazing is not as simple as it might soundCattle can damage forage crops by eating down to the rootsAlso，their weight crushes the soilThat can make the ground too hard for growingA way to reduce the damage from overgrazing is to move a
5、nimals from one field to anotherExperts say rotational grazing like this is extremely important for marginal landsWe will talk more about rotational grazing next weekAnother use for marginal lands is for tree cropsTrees help support the soilThey reduce the damaging effects of wind and rainAnd they c
6、an provide grazing animals with shade from the sunStudies have shown that the white pine and loblolly pine are two kinds of trees that grow well on marginal landsThey grow fast and provide good quality woodAnother kind to consider is the poplarAnd there are slowergrowing trees like the black walnut
7、that provide a nut crop as well as woodMarginal lands need careFailing to take that care might only make a bad situation worseBut good planning can turn a marginal resource into a highly productive oneTitle：1 Marginal Lands2 of marginal landsThe soil might 3 They might be on a hillside rising sharpl
8、y or in an area 4 They are to be planted last under good conditions and avoidedfirst under bad conditions5 use marginal landsBe used for grazing animalsBe used for 6 Types of plants to grow7 like clover and alfalfaFastgrowing trees like the white pine and loblolly pine；The poplar；Slowergrowing trees
9、 like the black walnut8 to use marginal landsEstablishing good ground coverAvoiding the loss of soil through erosion9 of the soilHelping support the soilReducing the damaging effects of wind and rain10 grazing animals【3】Thousands of years ago people guessed the time of day by watching the sunLater，t
10、hey found it was easier to tell the exact time by looking at the shadowsThus，the sundial (日晷) was inventedThe sundial proved a useful timepiece in sunny weatherHowever，another type of timepiece was necessary for cloudy weather and night timeA sand glass was another common measurer of timeTwo glass b
11、ottles were connected by a very small openingThe top bottle was filled with sand，which dropped slowly into the bottom one in a certain period of timeHour glasses were widely used thenThreeminute sand glasses are still used in many homes to time the boiling of eggsThe real ancestor of modern clocks w
12、as the water clockIn China，an early water clock was made up of several bowlsWater trickled (滴) from one bowl to another to keep the clock goingVisitors to the Beijing Palace Museum can still see the old water clock showing the time thereIn the Middle Ages a waterless clock was invented which worked by means of weig
