Question

阅读理解 　　All our food comes from the soil(土壤)．Some of us eat meat, but animals live on plants．If these were no plants, we should have no animals and meat．So the soil is necessary for life． 　　The top of ground is usually covered with grass or other plants．Plants grow in soil, which has a dark color．This dark soil is humus, dead leaves, dead plants and animal waste make it, but this takes a long time．When the humus has been made, plants can grow well in it． 　　All soil needs food．If we don’t give it any, the plants will be weak．Animals waste is the best food for the soil, but chemical fertilizers(化肥)are also very useful．The same crop should not be grown in the same place every year; it is better to have a different crop．A change of crop and the use of a good fertilizer will keep the land in good condition． 　　When the soil is dry, the wind blows it away．Sometimes heavy rain carries the humus down to a river．People should grow more and more trees and grass to stop wind from carrying the humus away．It takes hundreds of years to make humus, and so we must save every bit of it．Without soil, where can we grow food? (1) From the text, we know people live on ________． [　　] A． animal B． plant C． meat D． soil (2) The word “humus” means ________ in Chinese． [　　] A． 微生物 B． 土壤 C． 腐殖土 D． 粘土 (3) We should ________ to keep the soil． [　　] A． give more fertilizers B． kill more animals C． make more humus D． grow more trees and grass (4) We should save every bit of humus, because ________． [　　] A． it takes a long time to make humus B． the more humus in the soil, the better plants grow C． the chemical fertilizers are expensive D． A and B (5) The best title of this text should be ________． [　　] A． Soil is necessary to people B． The same crop can’t be grown in the same place every year C． Soil’s food is chemical fertilizers D． Humus is hard to make

Answer 1

答案：1．D;2．C;3．D;4．D;5．A;
解析：

(1)	综合考虑第一段的意思，唯有D才是最恰当的选项．
(2)	根据“This dark soil is humus, dead leaves, dead plants and animal waste make it, but this takes a long time．”一句所述，可推知这是一种由落叶、枯萎的植物以及动物的粪便在长时间的腐烂后所产生的一种东西．由此不难得出答案为C．
(3)	答案就在“People should grow more and more trees and grass to stop wind from carrying the humus away．”这一句话之中．
(4)	由“When the humus has been made, plants can grow well in it．”和“It takes hundreds of years to make humus，”这两句话所表达的意思，可知答案只能是D．
(5)	本文就是说明土壤对人类的重要性的．事实上，文章结尾的那句话已经点明主旨． 　　土壤是人类赖以生存的自然条件之一．没有了土壤或者是土壤受到了较为严重的破坏，就会直接危及到人类的生存．本文在阐述土壤的成因、特性和重要性之后，呼吁大家都要保护土壤．