分析 几乎所有的食物都来自土壤.当然,我们中的一些人吃肉,但动物也靠植物生活.如果没有植物,我们就没有动物、没有肉.所以土壤对生命而言是非常必要的地面的顶部通常覆盖着草或其他植物.草地上可能有枯死的落叶和死亡植物,动物的排泄物也落在它上面.
所有的土壤都需要食物,如果我们不给它,植物会生病变弱.动物的排泄物是土壤最好的食物,但是化肥也是非常有用的.同样的庄稼不应该每年在同一地方种植,最好种植不同的作物.作物的改变和良好肥料的使用将保持土地状况良好.
解答 41.C.细节理解题.根据Nearly all our food comes from the soil(土壤).可知,所有的食物均来源于土壤,因此虽然植物对我们的生活非常重要,但是The top of the ground is usually covered with grass or other plants.地表长着各种草和植物,因此the soil where the plants grow is more important,即生长着植物的土壤更加重要;
42.A.细节理解题.根据The same crop(庄稼) ought not to be grown in the same place every year;可知,同样的庄稼不应该每年在同一地方种植,言外之意就是在一年中,要种植不同的庄稼,这一点在下文中也提到了:A change of crop and the use of a good fertilizer will keep the land in good condition.即作物的改变和良好肥料的使用将保持土地状况良好.
43.B.细节理解题.根据Animal's wastes is the best food for the soil;可知,动物的排泄物是土壤最好的"食物",因此这里应该选择B.
44.D.细节理解题.根据文章最后一句A change of crop and the use of a good fertilizer will keep the land in good condition.可知,不同作物的交替种植和良好肥料的使用将保持土地状况良好,即如果我们想充分利用土壤生产更多的食物,我们就必须保证土壤的状况良好,选用的方法就是A change of crop和the use of a good fertilizer,即D选项正确.
点评 本文是一篇关于土壤改良及合理使用土壤的科普类文章.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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