问题 问答题 简答题

简述国外主要的“替代农业”。

答案

参考答案:

有机农业类似我国早期的传统农业,其含义是一种完全不用或基本不用人工合成的化肥、农药、生长调节剂和家畜饲料添加剂的农业生产体系。有机农业在可能范围内尽量依靠作物轮作、作物秸秆、家畜粪肥、豆类作物、绿肥、有机废物、含有矿物质养分的岩石和机械耕作,以保持土壤肥力和耕性,尽可能用生物防治抑制病虫和杂草的危害。

自然农业是由日本人富冈正信提出的,他主张农业生产应该顺应自然,尽可能减少人为对自然的干预。自然农业的主要内容包括不翻耕土地、不施用化肥、不用除草剂、不用化学农药。

生物农业是根据生物学原理建立的农业生产体系,靠各种生物学过程维持土壤肥力,使作物营养得到满足,并建立起有效的生物防治杂草和病虫害的体系。

生态农业是由美国土壤学家威廉姆•奥伯特1971年提出的,并在欧美地区有一定的实践。

生态农业的基本含义为:生态上能自我维持,低投入,经济上有生命力,有利于长远发展,并在环境、伦理道德方面及美学上能接受的小型农业。

阅读理解

阅读理解。

     A young man once went to buy a pair of pants. When he got home, he went upstairs (上楼) to his

bedroom and put them on. He found that they were two inches (英寸) long.

     Then he came out of his room to see his mother and his two sisters. They were washing something in

the kitchen. "These new pants are too long, they need to be shortened (缩短) about two inches. Would

one  of you  like to do this for me, please?" His  mother  and  sisters  were  busy and none of them said

anything. The mother went upstairs after she had finished washing and shortened the pants two inches.

But she didn't tell her daughters about it.

     Later on, after supper, the elder sister remembered her brother's pants. So she went upstairs without

saying to anyone, and shortened the pants two inches.

    The younger sister went to the cinema, but when she came back, she also remembered what her

brother had said. So she ran upstairs, and took two inches off the legs of the new pants.

1. The new pants were _______.      

A. too long for the young man      

B. two inches long

C. six inches long                

D. too short for the young man    

2. The young man asked ______to shorten his pants.

A. his mother and his two sisters      

B. his mother and one of his sister

C. his mother                

D. his mother or one of his two sisters

3. ______, his elder sister shorten his pants.

A. After supper            

B. After the mother finished washing

C. After the young man went upstairs

D. After the younger sister went to the cinema

4. How many inches were the legs of the new pants shortened by at last?

A. Two.  

B. Four.  

C. Six.  

D. Eight.

5. When the young man put on the pants, he would _______.

A. feel happy  

B. be very sad  

C. thank his family  

D. be very excited

单项选择题