Question

 All our food comes from the soil. Some of us eat meat,but most animals live on plants. If there are no plants,we should have no animals and meat. So the soil is necessary for life.

 The top of the 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. Animal waste is the best food for the soil,but chemical fertilizers are also very useful. The same crop should not be grown in the same place every year,and 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 the 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,so we must save every bit of it. Without soil,where can we grow food?

根据材料内容选择最佳答案。

(   ) 1. From the text,we know people live on         .

A. animal     B. plant

C. meat     D. soil

(   ) 2. What does the word humus mean in Chinese?

A.微生物  B. 土壤

C.腐殖质  D.黏土

(   ) 3. We should         to  keep soil good.

A. give more fertilizers

B. kill more animal

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 main idea 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

1.D根据文章第一段可知人类生存依赖土壤。

2.C根据第二段humus的作用可猜测出答案。

3. A 根据第三段第二句话 chemical fertilizers are also very good.可知答案选A.

4. A 根据第四段第四句话It takes hundreds of years to make humus so...可知答案选 A.

5. A根据第一段可知该文讲土壤的重要作用。