首页
登录
职称英语
[originaltext] Today, I’d like to talk about some of the changes land can und
[originaltext] Today, I’d like to talk about some of the changes land can und
游客
2023-08-14
70
管理
问题
Today, I’d like to talk about some of the changes land can undergo, specifically desertification, that’s the process through which land becomes part of a desert. Now a desert is defined as a place that receives a certain maximum amount of rainfall. But you may not know that it usually takes more than just a lack of water to turn productive land into a desert. There are several specific human activities that when combined with a lack of rainfall encourages desertification. For example, over cultivation, growing more crops than soil can support. The soil loses its nutrients, so it needs either to be fertilized or to be left unused for at least a season. But if neither of these things happens, if these nutrients in the soil don’ t get replaced, the damaged soil stops producing. Another cause of desertification is overgrazing. That’s when the grasses and trees and shrubs of an area are expected to feed more animals than they reasonably can. Too many animals eating in the same area will kill the vegetation. And because it’s the roots of this vegetation that hold much of the soil together, when too much of the vegetation dies, the soil erodes. But maybe the most ironic example of human behavior that can lead to desertification is irrigation. It may seem to run counter to common sense to say that introducing water into an area can cause it to become more like a desert But there are plenty of bad irrigation practices that do just that Bringing in too much salty water and then not providing adequate drainage for it will fill the soil with salt, and turn the area into a desert.
Now listen to the following recording and answer questions 16 to 19.
16. How is the soil damaged by over cultivation?
17. What is overgrazing?
18. How does overgrazing damage soil?
19. According to the speaker, what is the main problem with irrigation?
选项
A、It receives more nutrients than it can absorb.
B、It becomes oversaturated with water.
C、It loses the ability to support insect life.
D、It loses nutrients that aren ’t replaced.
答案
D
解析
细节题。根据For example,over cultivation, growing more crops than soil can support.The soil loses its nutrients可知,过度耕种也就是超过土地承载力种植过多的植物,会导致土地营养流失。因此,正确答案是D。
转载请注明原文地址:https://tihaiku.com/zcyy/2926807.html
相关试题推荐
[originaltext]Ifyou’recarefulenough,you’llfindthatitiscommonnowad
[originaltext]Peter:(19)ThelawontaxisisveryinterestingandIknowinLon
[originaltext]Peter:(19)ThelawontaxisisveryinterestingandIknowinLon
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
随机试题
OnReviewingandImprovingWrittenWorkTeachersfeelveryf
“中国梦”(ChineseDream)是一个新名词,于2012年由习近平主席首次提出。“中国梦”实质上指要实现中华民族的复兴(rejuvenation
CuttingYourOwnCDIfyourdreaminlif
周先生,45岁,企业主管,身高175cm,体重95kg,血压135/85mmHg
27岁经产妇,妊娠37周,今晨起床时发现阴道流血,量中等,无明显腹痛,无明显宫缩
卡托普利:A.洋地黄类正性肌力药 B.肾上腺能受体兴奋剂 C.磷酸二酯
变电运维管理规定生产准备任务主要包括:运维单位明确、()、工器具及仪器仪表
A.如题干所示 B.如题干所示 C.如题干所示 D.如题干所示
人员推销的主要任务包括()。A:降低风险 B:开拓市场 C:传递信息 D:
甲公司与客户订立一项合同,约定转让软件许可证、实施安装服务并在2年期间内提供未明
最新回复
(
0
)