首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、They are rare species. B、They protect the environment. C、They pollinate crops and wild plants. D、They protect crops and wild p
A、They are rare species. B、They protect the environment. C、They pollinate crops and wild plants. D、They protect crops and wild p
admin
2017-04-28
31
问题
A new study says a widely-used insecticide is damaging wild bee populations.(3)Wild bees are important, because they pollinate(授粉)crops and wild plants. Environmentalists in the United States and Europe say this insecticide is causing a drop in the number of bees.
These insecticides are among the most commonly-used worldwide. Farmers often use seeds treated with the insecticides. The chemicals target insects that eat crops, and they do not spread beyond the field. But they do get into pollen(花粉)and nectar(花蜜), which is where the bees come into contact with them. Researchers studied bees in fields. They say there were about half as many wild bees per square meter in treated fields as in untreated ones. Using the chemicals too much may be hurting bees.(4)They suggest that the chemicals should be used more sensibly, or. in other words, only when necessary.
3. Why are wild bees important?
4. What do researchers suggest when using chemicals?
选项
A、They are rare species.
B、They protect the environment.
C、They pollinate crops and wild plants.
D、They protect crops and wild plants.
答案
C
解析
转载请注明原文地址:https://jikaoti.com/ti/52jFFFFM
0
大学英语四级
相关试题推荐
ShouldRetirementAgeBePostponed?1.近年来推迟退休年龄引起人们的热议2.推迟退休年龄有利也有弊3.我的看法
Forthispart,youareallowed30minutestowriteashortessay.Youshouldstartyouressaywithabriefdescriptionofthepi
HowtoMakeYourFridgeMoreEfficientA)Modernrefrigeratorsarefarmoreefficientthantheyusedtobe,buttheystilldrawa
A、Softdrinkscausechildren’saggressivebehavior.B、Softdrinkshavetoomuchsugar.C、Sodaistheworstsoftdrink.D、Childre
A、Itissomethingthattheycancontrol.B、Theyknowthesituationwellenough.C、Theyarealwaysverypowerful.D、Theyhateto
It’sdifficulttoimaginetheseaeverrunningoutoffish.It’ssovast,sodeep,somysterious.【B1】______,it’snotbottomles
A、Hewasheldupbythetrafficjam.B、Hissecretaryforgottoremindhimofit.C、Hewasastrangertotheplace.D、Heforgotw
Duringthenineteenthcentury,whenlittlewasknownaboutenvironmental-ismandconservation,itwascommontohearpeopleinE
Procrastinators(拖延症患者),takenote:Ifyou’vetriedbuildingself-disciplineandyou’restillputtingthingsoff,maybeyouneed
A、NegotiatingapriceisnotcommonintheUnitedStates.B、CardealersintheUnitedStatesarenothonest.C、Newcarsarevery
随机试题
如图3,该作品的构图方式是()
化学需氧量(COD)反应了在一定条件下()。
A.可使前者吸收减少,活性减低B.可形成不溶性络合物,使口服吸收率减少C.可加重肝损害D.增加麦角中毒的风险E.疗效增强四环素类药与抗酸剂如碳酸氢钠合用时()。
属于嵌锁型粒料类路面基层或底基层有( )。
交易指令中,()是指执行时必须按限定价格或更好的价格成交的指令。
银行市场营销活动的微观环境包括()。
一般来说,金融工具具有基本特征有()。
十七大首次将“基层群众自治制度”纳人中国特色政治制度范畴,这是我党不断推进社会主义民主政治制度自我完善和发展的具体体现。除“基层群众自治制度”外,中国特色政治制度还包括()。①选举制度⑦人民代表大会制度③中国共产
ThespeakerthinksthattobeateacherismoredifficultthantobethepresidentoftheNEA.Thereisabiggapbetweenthee
Wearelookingforwardtohearingfromyouverysoon,andwewillkeepyouinformed,byphone,ofanynewdevelopments.
最新回复
(
0
)