首页
登录
职称英语
Trees are useful to man in three important ways: they provide him with wood
Trees are useful to man in three important ways: they provide him with wood
游客
2025-03-08
8
管理
问题
Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts and floods.
Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. (78)
In his eagerness to make money from trees,he has cut them down in large numbers , only to find that without them he has lost the best friends he had.
And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.
This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil—allowing the rain to sink in—and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert.
Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It set up the empire but, without its trees, its soil became poor and it grew weak. When the empire fell to pieces; the home country found itself faced with floods and starvation. [br] Why does land become desert after all trees are cut down?
选项
A、Because nothing remains on land except floods.
B、Because there are no longer trees to keep the rain and protect the top-soil.
C、Because too much rain sinks in and washes away the top-soil.
D、Because roots of the trees break up the soil.
答案
B
解析
第二段最后一句话提到当顶层土壤被冲走,就只剩下沙漠。而土被冲走是因为没有森林保存雨水,所以选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3988006.html
相关试题推荐
Itisextremelyimportantforanengineertoknowtouseacomputer.A、ItisB、ex
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityof
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityof
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityof
Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]
Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]
Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]
It’simportanttomethatyou______there.A、areB、beC、wereD、willbeB本题考查虚拟语气在
Argumentsmayconcernsuchunimportantmattersasstylesofdressorhairdos.(P
(Let’snot)wastelimeon(mattersofnoimportant).Wehaveother(vital)probl
随机试题
Theyreallyhaveagreattimetoo,designingeverything,drawingtheblueprints
Severalcenturiesago,whenEuropeanpeoplemarveledatthefinepotteryshi
ThereportfromtheBureauofLaborStatisticswasjustasgloomyasanticip
______PacificOceanis______verylargeseatothewestofNorthandSouthAmeric
Everychemicalchangeeitherresultsfromenergybeingusedtoproducethechang
李先生,30岁,身高180cm,体重86kg。 李先生体质指数是A.24.
下述各项,不属排卵期出血特点的是()A.出血常发生在体温开始上升时 B.
癌细胞分化越差A.核胞质比失调越明显B.核缩小越明显C.核淡染越明显D.胞质颜色
案例十 下面是某求助者的WAIS-RC的测验结果 根据该求
下列关于基坑开挖边坡失稳的预防及处理措施错误的是()。A.基坑开挖之前,应先做
最新回复
(
0
)