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
Where Have All the Bees Gone? Scientists who study insects have a real mystery on their hands. All across the country, honey
Where Have All the Bees Gone? Scientists who study insects have a real mystery on their hands. All across the country, honey
admin
2013-10-25
55
问题
Where Have All the Bees Gone?
Scientists who study insects have a real mystery on their hands. All across the country, honeybees are leaving their hives and never returning. Researchers call this phenomenon colony-collapse disorder. According to surveys of bee keepers across the country, 25 to 40 percent of the honeybees in the United States have vanished from their hives since last fall. So far, no one can explain why.
Colony collapse is a serious concern because bees play an important role in the production of about one-third of the foods we eat. As they feed, honeybees spread pollen from flower to flower. Without this process, a plant can’t produce seeds or fruits.
Now, a group of scientists and beekeepers have teamed up to try to figure out what’s causing the alarming collapse of so many colonies. By sharing their expertise in honeybee behavior, health, and nutrition, team members hope to find out what’s contributing to the decline and to prevent bee disappearance in the future.
It could be that disease is causing the disappearance of the bees. To explore that possibility, Jay Evans, a researcher at the United States Department of Agriculture(USDA)Bee Research Laboratory, examines bees taken from colonies that are collapsing. "We know what a healthy bee should look like on the inside, and we can look for physical signs of disease, " he says. And bees from collapsing colonies don’t look very healthy. "Their stomachs are worn down, compared to the stomachs of healthy bees, " Evans says. It may be that a parasite is damaging the bees digestive organs. Their immune systems may not be working as they should. Moreover, they have high levels of bacteria inside their bodies.
Another cause of colony-collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops, says Jerry Hayes, chief bee inspector for the Florida Department of Agriculture. Some studies, he says, suggest that a certain type of insecticide affects the honeybee’s nervous system(which includes the brain)and memory. "It seems like honeybees are going out and getting confused about where to go and what to do, " he says.
If it turns out that a disease is contributing to colony collapse, bees genes could explain why some colonies have collapsed and others have not. In any group of bees there are many different kinds of genes. The more different genes a group has, the higher the group’s genetic diversity. So far scientists haven’t determined the role of genetic diversity in colony collapse, but it’s a promising theory, says Evans.
What explanation is given by Jerry Hayes to the phenomenon?
选项
A、Farmers apply certain chemicals to kill unwanted bees.
B、The insecticide destroys the honeybee’s nervous system.
C、The insecticide affects the honeybee’s memory.
D、All of the above.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/uXmd777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
Youwillhearfivepeoplegivingreasonswhychildrenlearntheirmothertonguesowell.Beforeyoulisten,readthelistof
Lookatthetenstatementsforthispart.Youwillhearastoryabout"CommunicationThroughTime".Decidewhetheryou
Youwillhearfivepeoplegivingtheiropinionsonspankingchildren.Forquestions9-13,choosefromthelistA-Fwhateac
Youwillhearfivepeoplegivingtheiropinionsonspankingchildren.Forquestions9-13,choosefromthelistA-Fwhateac
DearDavid,I’mgoingtovisityourcountrynestmonth.I’mgoingtotravel【B1】______twofriends.Wedon’tknow【B2】____
MyExperienceaboutEnglishOnesummernight,onmywayhomefromworkIdecidedtoseeamovie.Iknewthetheatrewouldbeair
Thepriceofvegetablesvariesaccordingtotheweather.
CellPhones:HangUporKeepTalking?Millionsofpeopleareusingcellphonestoday.Inmanyplacesitisactuallyconsider
Whendoesthenexttraindepart?
Whenshewasinvitedtotheparty,shereadilyaccepted.
随机试题
Findingagoodwork-at-homejobisnoteasy.Althoughyouseealltheonlineadvertising,therearen’tthatmanyofthem.Those
呈肾形,略扁,果皮具有细微网状皱纹的药材是
患者男,60岁。无痛性全程肉眼血尿,伴腰痛,消瘦,体重下降;查体:腹软,未扪及明显包块,肾区叩痛(一)。全血细胞计数:白细胞13×109/L,中性粒细胞85%,肾功能肌酐60μmol/L,尿素氮6.1mg/L,血沉20mm/h,尿常规:红细胞(++),尿细
男性,52岁,有烧心、反酸、反胃病史3个月,伴咽下梗噎感,胸骨后疼痛,消瘦,体重减轻。用抑酸剂及促动力药物治疗不见好转,查血红蛋白为60g/L,最近症状呈进行性加重,伴黑便。可能诊断是
A.乳香B.桔梗C.生地D.龙胆E.荆芥应通风干燥、防虫蛀的中药是
相同牌号的碳素结构钢中,P、S含量最低的钢的等级是()。[2010年真题]
当工程师与承包商就索赔问题经过谈判不能达成一致意见时,应( )。
施工单位应当为施工现场的人员办理意外伤害保险。意外伤害保险费应由()支付。
调查反馈属于组织发展方法中的( )。
Iletmychildrenmaketheirowndecisions______they’reolder:Iwouldn’tpresumetointerfere.
最新回复
(
0
)