首页
登录
职称英语
[originaltext] Why, you may wonder, should spiders be our friends? Because th
[originaltext] Why, you may wonder, should spiders be our friends? Because th
游客
2023-09-15
51
管理
问题
Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insects include some of the greatest enemies of the human race. Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals. We owe a lot to the birds and beasts which eat insects but all of them put together kill only a fraction of the number destroyed by spiders. Moreover, unlike some of the other insect eaters, spiders never do the harm to us or our belongings.
Spiders are not insects, as many people think, nor even nearly related to them. One can tell the difference almost at a glance, for a spider always has eight legs and insect never more than six.
How many spiders are engaged in this work in our behalf? One authority on spiders made a census of the spiders in grass field in the south of England, and he estimated that there were more than 2 250 000 in one acre; that is something like 6 000 000 spiders of different kinds on a football pitch. Spiders are busy for at least half the year in killing insects. It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day. It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
选项
A、Because they are beneficial insects.
B、Because they destroy insects without hurting us in any way.
C、Because they protect insect-eating animals.
D、Because they include some of the greatest enemies of the human race.
答案
B
解析
Why does the author say that spiders are our friends?
选项均出现because,根据beneficial, destroy, protect等词可以推断是关于they的益处。
综合理解题。蜘蛛可以帮助人类消灭一些害虫。并且不会对人类造成危害。同时,第二段提到蜘蛛不属于昆虫,可排除A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3014837.html
相关试题推荐
[originaltext]Darwinwasagreatscientist.Hestudiedlivingthingsinthe
[originaltext]Darwinwasagreatscientist.Hestudiedlivingthingsinthe
[originaltext]W:Look,I’msorry,butthebooksforChem.100aren’tinyet.M:
[originaltext]W:Look,I’msorry,butthebooksforChem.100aren’tinyet.M:
Youshouldbeawarethat______(后悔错过的机会和说过的话无济于事).itisnouseregrettingmissed
[originaltext]Doyouknowthatvegetablescanbegrowninclimatetheyare
[originaltext]Everycountrytendstoacceptitsownwayoflifeasbeingth
[originaltext]M:Wereacheddirectlyouttobothschooladministratorstofind
[originaltext]M:Wereacheddirectlyouttobothschooladministratorstofind
[originaltext]W:Hi,Jack.M:Ah,Mary.Howareyou?W:Oh,fine.How’sitgoin
随机试题
WHAT’SINVOLVEDINRAPIDREADINGInvestigationsofe
Fiftyyearsfromnowtheworld’spopulationwillbedeclining,withnoendi
Muchoftoday’sscienceofphysicsisbasedonNewton’sdiscoveryofthethr
依据JTG2182-2020,某检测工程师使用光时域反射仪进行光纤接头损耗平均
33岁女性,双胎妊娠,胎膜早破,规律宫缩14小时,子宫颈口开大2cm,行剖宫产术
A.臭豆腐、豆酱等 B.肉制品、剩米饭 C.禽蛋类 D.鱼虾蟹贝类等 E
A."B"B."S"C."F"D."H"E."T"药品批准文号的格式为:国药准字
当前国内生态旅游度假村市场格局基本已定,中低档度假村供给相对不足,且环境较差、服
一般架空输电线路验算导线允许载流量时,关于导线允许温度的取值,下列哪项是不正确的
建设工程项目风险评估的工作,不包括()。A.对项目风险的对策进行风险响应 B.
最新回复
(
0
)