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
2024-04-06
4
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、The animals overfertilize the soil.
B、Dead plant roots can’t hold the soil together.
C、The wrong types of plants are left standing.
D、There is a buildup of plant and animal matter.
答案
B
解析
细节题。根据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.可知,过度放牧会严重破坏植被,而这些植被的根能够凝沙固土,一旦植被被破坏,土地就会退化。因此,正确答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/3543069.html
相关试题推荐
[originaltext]AsIamsureyouareaware,historyisfullofpeoplewhowere
[originaltext]AsIamsureyouareaware,historyisfullofpeoplewhowere
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology.
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology.
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology.
[originaltext]Today,I’dliketotalkaboutsomeofthechangeslandcanund
[originaltext]Today,I’dliketotalkaboutsomeofthechangeslandcanund
[originaltext]Today,I’dliketotalkaboutsomeofthechangeslandcanund
[originaltext]Thereareseveralwaysyoucanfindoutaboutthecountriesan
[originaltext]Thereareseveralwaysyoucanfindoutaboutthecountriesan
随机试题
Hismeannesshasbecomesomethingofa_____jokeamonghisfriendsandcolleagues
PartyA:ShanghaiInternationalTradeCorporationPartyB:BritishAARBankGro
钢丝直径1.8-4.0mm以外其他基材的热塑性粉末涂料双涂涂层厚度为()。A.
目前导致我国人群死亡的前十位疾病的病因和疾病危险因素中,比例最高的是A.行为生活
治疗神经衰弱阴虚火旺证,应首选A、右归丸 B、肾气丸 C、酸枣仁汤 D、大
下列是胎儿肺成熟度检查的羊水试验,但除外A.羊水泡沫振荡试验B.羊水葡萄糖测定C
直线型监理组织形式的优点是()。A:没有职能部门,实行“个人管理” B:要求
古代书画以纸或绢为载体,因而也被称为“纸绢画”。不同时代的纸绢会自然而然带有该时
2022年2月23日,态环境部等7部门联合印发《重点海域综合治理攻坚战行动方案》
甲省A市中级人民法院作为合同履行地法院受理了一起合同纠纷案件,出现下列情形,处理
最新回复
(
0
)