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
2024-01-17
4
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. In his eagerness to make money from trees, he has cut them down inlarge 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 ran falls on hard ground and flows away, causing floods and canying 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
事实细节题。第二段最后一句话提到当顶屋土壤被冲走,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/3371463.html
相关试题推荐
ProfessorSmithissaid______anotherimportantdiscoveryinchemistry.A、tomake
It’simportanttomethatyou______there.A、areB、beC、wereD、willbeB本题考查虚拟语气在
对于许多家长来说,没有任何事情比养育一个能够分辨是非的孩子更重要。Formanyparents,nothingismoreimportanttha
It’simportanttolocateindustriesinareaswhereasupplyofrawmaterialsis
(Let’snot)wastelimeon(mattersofnoimportant).Wehaveother(vital)probl
Preparationsarebeingmadefortheimportantmeeting______soon.A、heldB、holdin
—Youhaven’tfailedintheexam,haveyou?—______.Theexamissoimportantto
Weoftenprovideourchildrenwithtoys,footballsorbasketballs,______thatal
Treesareusefultomaninthreeimportantways:theyprovidehimwithwood
Treesareusefultomaninthreeimportantways:theyprovidehimwithwood
随机试题
Whatmakesagroupintelligent?Youmightthinkagroup’sIQwouldbesimply
在拉、拽、搬动触电者时,应(),使触电者脱离电源。A.用金属或潮湿的物品做工具
自我传播是A.共享信息的最基本传播形式B.组织以外的小群体的传播活动C.媒体组织
下列选项中,哪个是在安阳殿墟出土的《后母戊鼎》?()
根治折返性室上性心动过速首选的方法是A.外科手术 B.射频消融术 C.长期服
患者,男,28岁。1天前因饮食不洁,出现腹痛腹泻,下痢赤白,里急后重,肛门灼热,
月经量少,色淡暗,质稀,其辨证是A.气虚证 B.血虚证 C.肾阴虚证 D.
下列选项中不属于对企业现金流和企业价值变动影响最大的风险是()。A:信用风险
消防车通道的最小转弯半径是消防车回转时消防车的前轮外侧循圆曲线行走轨迹的半径:我
广谱抗真菌药物是() A.利福平 B.利巴韦林 C.伯氨喹 D.氟康唑
最新回复
(
0
)