题目内容
10.Why do plants grow in some places and not in others?Why does some land have so much growing on it,while other land has almost no plants growing on it at all?To grow,plants need several things.One is warmth.In very cold places almost nothing grows.Plants also need water.In very dry parts of the Earth only a few unusual plants can grow.That's why dry deserts(沙漠) everywhere are almost not covered by trees or grass.
Plants must also have a place in which to put down their roots and grow.They find it difficult to grow on hard land.The town is built on hard land.The plants here have only the soil(土壤) found between the cracks of the stones to grow in.
Another thing plants must have before they can grow is food.
What will happen if we try to make things grow on the sandy beach?A few plants,such as beach grass,will grow in sand,but most plants won't.Even if the weather is warm enough and we water the plants each day,many of them will die because the sand on this beach has almost no plant food.
68.The passage can most probably be found inA.
A.a science book
B.a newspaper
C.a magazine
D.a report
69.Plants needC things to grow well according to the passage.
A.two
B.three
C.four
D.five
70.The reason why most plants can't grow on the sandy beach is thatD.
A.there isn't enough sunlight
B.there is too much water
C.it is too crowded there
D.it has little food for plants
71.Which of the following is true?B
A.Beach grass can hardly grow in sand.
B.Plants need food to help them grow.
C.Plants want a place where their flowers can come out.
D.Dry deserts everywhere are almost covered by trees or grass.
分析 为什么植物在某些地方生长,而在其他地方不生长?为什么有的地方长满植物,而有的地方几乎没有植物?
植物生长需要几个条件,第一个是适宜的温度,太冷的地方基本上上没有任何的植物;第二个是水,在地球上的一些干旱地区只有几种特殊的植物生长,这也就是为什么沙漠中没有草和树;
植物还需要一个适宜的地方扎根;植物生长的另一个条件就是营养物质;在沙滩上,即使我们给他浇水植物也很难生存,原因就是沙滩中没有植物所需要的营养物质;
解答 68.A.文章主旨题.根据文章的内容,主要讲述的就是植物生长所需要的条件,例如水分、营养等,因此这篇文章应该出现在科学杂志中,因此答案为A.a science book
69.C.细节理解题.根据One is warmth.In very cold places almost nothing grows.Plants also need water.可知,植物生长需要适宜的温度和水分,另外根据Plants must also have a place in which to put down their roots and grow.可知,植物的生长还需要一个供其根部生长的土壤环境,而且根据Another thing plants must have before they can grow is food.可知,植物生长所需要的条件之一还有营养物质,因此应该是4个,故答案为C.four
70.D.细节理解题,根据题干中出现的sandy beach定位于文章中的第五段(最后一段),根据Even if the weather is warm enough and we water the plants each day,many of them will die because the sand on this beach has almost no plant food.可知,即使提供合适的温度以及经常给它们浇水,这些种植在沙滩中的植物也不能存活,原因就是这里几乎不含有植物所需要的营养物质;因此答案为D.it has little food for plants
71.B.推理判断题.根据Another thing plants must have before they can grow is food.可知,植物的生长需要营养物质,因此B选项描述正确;
点评 本文是一篇科普类文章.做题时要在理解好文意的基础上,与题目有机的结合,从文章中找到相关细节性的句子与选项细细比对,进行选择或推理判断,选出符合文章内容的正确选项.做题注意灵活,有时可采用排除法或直选法确定出最终答案.
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