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
2011-01-22
22
问题
Where Have All the Bees Gone?
Scientists who study insects have a real mystery on their hands. All across the country, honey bees are leaving their hives(蜂巢) and never returning. Researchers call this phenomenon colony-collapse(群体瘫痪) disorder. It is reposed that 25 to 40 percent of the honeybees in the US 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(花粉)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. They 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 (SDA) 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(寄生虫) making the bees’ digestive organs. Their immune(免疫的)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 (杀虫剂)affects the honeybee’s newels system 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 have, 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.
Which of the following is a possible cause of the colony-collapse disorder?
选项
A、Population explosion.
B、Decreasing number of flowers around
C、Genetically modified products.
D、Diseases and chemicals.
答案
D
解析
本题是细节题。涉及的原文是“It could be that disease is causing the disappearance of the bees”和“…Another cause of colony-collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops”,因此可以判断D正确。
转载请注明原文地址:https://kaotiyun.com/show/ktUd777K
本试题收录于:
职称英语综合类A级题库职称英语分类
0
职称英语综合类A级
职称英语
相关试题推荐
SharksPerformaServiceforEarth’sWatersItishardtogetpeopletothinkofsharksasanythingbutadeadlyenemy.They
MillionAmericansSufferfromSocialAnxietyDisorderSocialanxietydisorderpreventssome15millionAmericansfromleadin
ReadwithGreaterSpeedDoyouhavedifficultyreadinginclass?Ifso,aspecialreadingprogramthathelpsmatchsoundswi
HintsforReadingPracticeMostofUScanfind15minutesorhalfanhoureachdayforsomeregularactivity.Forexample,o
TheExplodingLakesofCameroonWhatcomestomindwhenyouthinkofalake?Youprobablyimagineaprettyscenewithbluew
AHeroicWomanThewholeoftheUnitedStatescheereditslatesthero,AshleySmith,withtheFederalBureauofinvestigatio
Thelatestcensusisencouraging.
Herspecialityisheartsurgery.
Frommystandpoint,thisthingisjustridiculous.
Hewaselevatedtothepostofprimeminister.
随机试题
调剂的一般程序不包括
十五别络的组成是
某女患者,产后28天,恶露不止,量较多,色深红,质黏稠,有臭味,面色潮红,口燥咽干,舌质红,脉虚细而数。治宜
甲有限责任公司(债务人)和乙公司(债权人)债务重组资料如下:(1)2×19年3月6日,甲公司从乙公司购买一批材料,约定6个月后甲公司应结清款项5000万元(假定无重大融资成分)。乙公司将该应收款项分类为以公允价值计量且其变动计入当期损益的金融资产;甲公司
Deareditor,IamEvanfromCanada.Beingtheeldestchildinthefamilyhasitsdisadvantages.Firstofall,Ihavetoshare
(2021年联考)喜欢旅游的赵某准备在今年夏天去爬三座名山,计划从黄河或长江发源地出发,沿黄河或长江其中一条干流流经省份由西向东走,下列肯定不是其规划路线的是()。
Devil,V8,Anal,Christ;theseareamongthebabynames【C1】______byNewZealand’sdepartmentofinternalaffairs,whorecently【C
某系统集成公司制订了一系列完备的质量管理制度,其中一项是要求每个项目在各个阶段的最后都必须进行质量审计。这种审计活动是______过程的一部分工作。
A.RewardsfollowingtheUSfinancialinjectionB.Mir’sfirstsinscientificexperimentsandspaceexplorationC.UndeniableMi
Educatortodayaremoreandmoreoften【C1】______tosaythatcomputerliteracyisabsolutelynecessaryforcollegestudents.Man
最新回复
(
0
)