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
2011-01-05
35
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 (瓦解) disorder. According to surveys of beekeepers (养蜂人) across the country, 25 to 40 percent of the honeybees in the United States have vanished from their hives (麻疹) 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 (专家的意见) in honeybee behavior, health, and nutrition, team members hope to find out what’s contributing to the decline and to prevent bee disappearances 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 s 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 (差异) in colony collapse, but it’s a promising theory, says Evans.
According to the fifth paragraph, which of the following about bees’ genes is true?
选项
A、Bees’ genes allow them to expand their colonies.
B、Bees’ genes help keep them in their hives.
C、Bees’ genes make them fly from flower to flower.
D、Bees’ genes could explain the collapse of some colonies.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/N0Qd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
HappyMarriage,HappyHeartHappilymarriedpeoplehavelowerbloodpressure【C1】______unhappilymarriedpeopleorsingles,a
TheIcemanOnaSeptemberdayin1991,twoGermanswereclimbingthemountainsbetweenAustriaandItaly.Highuponamount
ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalcloc
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
AmericanDreamsThereisacommonresponsetoAmericaamongforeignwriters:theUSisalandofextremeswherethebestoft
FactsaboutStroke1Every45seconds,someoneinAmericahasastroke.Every3.1minutes,someonediesofone.Strokekilled
Whycan’tyoustopyour(eternal)complaining?
Whydoescreamgobadfasterthanbutter?Someresearchersthinktheyfoundtheanswer,anditcomesdowntothestructureofth
Atthattime,wedidnotfullygraspthesignificanceofwhathadhappened.
随机试题
下列给定程序中,函数fun的功能是:将s所指字符串中的所有数字字符移到所有非数字字符之后,并保持数字字符串和非数字字符串原有的次序。例如,s所指的字符串为“dei35adh3kjsdf7”,执行后结果为“defadhajsdt3537”。请在程序的下划
在敏捷制造中,最核心的资源是()
A、血液中性粒细胞显著增高B、血液单核细胞显著增高C、血液异型淋巴细胞显著增高D、血液淋巴细胞持续显著增高E、血液嗜碱性粒细胞显著增高中性粒细胞型类白血病可见
某建筑公司制定的生产安全事故现场处置方案,按规定应()至少组织一次演练。
根据我国《合同法》的规定,合同履行中条款空缺首先应当()。
会计软件要具有最大限度地发现错误并提供必要修改手段的功能,即要具有足够的()功能。
弗罗伊德描绘了一场人格的两个不同部分()之间无休止的战争,而这场战争由自我来协调。[2007年真题]
下列哪项属于社会工作者在倡导劳动力市场规范方面的努力?()。
一些乡村在变为城镇的过程中,虽然面貌________,但很多曾经让人留恋的东西却________。人们或多或少有这样的________,快速的、大规模的城镇化会不会使“乡愁”无处安放?填入画横线部分最恰当的一项是:
在数据库系统中,数据模型包括概念模型、逻辑模型和()。
最新回复
(
0
)