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1、最新2017年职称英语卫生类阅读理解模拟题11_职称英语模拟题职称英语网权威发布2017年职称英语卫生类阅读理解模拟题11，更多2017年职称英语卫生类阅读理解模拟题11相关信息请访问职称英语考试网。Scientists who study insects have a real mystery on theirhandsAll across the country，honeybees are leaving their hives and neverreturning Researchers call this phenomenon colony-collapse1 disorderAcco
2、rdingto surveys of beekeepers across the country，25 to 40 percent of the honeybeesin the United States have vanished from their hives since last fallSo far，noone can explain whyColony collapse is a serious concern because bees playan important role in the production of about one-third of the foods w
3、e eatAsthey feed，honeybees spread pollen from flower to flowerWithout this process，aplant cant produce seedsor fruitsNow，a group of scientists andbeekeepers have teamed up to try to figure out whats causing the alarmingcollapse of so many colonies By sharing their expertise in honeybee behavior，heal
4、th，and nutrition，team members hope to find out whats contributingto thedecline and to prevent bee disappearance in the futureItcould be that disease is causing the disappearance of the bees To explore that possibility，Jay Evans，a researcher at the United States Department ofAgriculture (USDA) Bee Re
5、search Laboratory2，examines bees taken from coloniesthat are collapsing“We know what a healthy bee should look like on theinside，and we can look for physical signs of disease,” he says And bees fromcollapsing colonies dont look very healthy “Their stomachs are worndown，compared to the stomachs of he
6、althy bees,” Evans saysIt may be that aparasite is damaging the bees digestive organs Their immune systems may not be working as they shouldMoreover，they have high levels of bacteria inside theirbodiesAnother cause of colony-collapse disorder may be certain chemicalsthat farmers apply to kill unwant
7、ed insects on crops，says Jerry Hayes，chief beeinspector for the Florida Department of Agriculture3Some studies，hesays，suggest that a certain type of insecticide affects the honeybees nervoussystem (which includes the brain) and memory”It seems tike honeybees are goingout and getting confused about w
8、here to go and what to do,” he saysIf itturns out that a disease is contributing to colony collapse，bees genes couldexplain why some colonies have collapsed and others have notIn any group ofbees there are many different kinds of genesThe more different genes a grouphas，the higher the groups genetic
9、 diversitySo far scientists haventdetermined the role of genetic diversity in colony collapse，but its a promisingtheory，says Evans词汇：honeybee/5hQnIbi:/n蜜蜂 parasite/5pArEsait/n寄生虫；寄生生物hive/haiv/n蜂巢；蜂箱 digestive/di5dVestiv,dai-/adj消化的pollen/5pClEn/n花粉 immune/i5mju:n/adj免疫的beekeeper/5bi:ki:pE (r)/n养蜂人 insecticide/in5sektisaid/n杀虫剂expertise/7ekspE5ti:z/n diversity/dai5vE:siti/n多样性第 4 页 共 4 页