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
The koala, one of Australia’s most treasured creatures, is in trouble? In Queensland, the vast state in Australia’s northeastern
The koala, one of Australia’s most treasured creatures, is in trouble? In Queensland, the vast state in Australia’s northeastern
admin
2014-01-09
42
问题
The koala, one of Australia’s most treasured creatures, is in trouble? In Queensland, the vast state in Australia’s northeastern corner, surveys suggest that from 2001 to 2008, their numbers dropped as much as 45 percent in urban areas and 15 percent in bush land.
While climate change and habitat loss are affecting koalas and many other Australian animals— from birds and frogs to marsupials like wombats—it is a bacterial infection that is worrying many scientists about the fate of the koala. "Disease is a somewhat silent killer and has the very real potential to finish koala populations in Queensland," said Dr. Amber Gillett, a veterinarian at the Australia Zoo Wildlife Hospital in Beerwah.
The killer is chlamydia, a class of bacteria far better known for causing venereal disease in humans. Recent surveys show that chlamydia has caused symptoms in up to 50 percent of Queensland’s wild koalas, with more probably infected but not showing symptoms. The bacteria— transmitted during birth, through mating and possibly through fighting—come in two strains, neither the same as the human form. One form can jump to other species, but so far there is no evidence that it has spread from koalas to humans or vice versa.
Chlamydia causes a host of symptoms, including eye infections that can lead to blindness, respiratory infections and cysts? The epidemic has been severe in Queensland, where most koalas are infected with koala retrovirus, said Dr. Gillett. This retrovirus is an H. I. V. -like infection that suppresses the immune system and interferes with its ability to fight off chlamydia.
Treating chlamydia in wild koalas is a challenge. Only a small percentage of the animals can be treated successfully and returned to the wild. And infected females often become infertile, so future population growth is affected as well. There is no treatment available for koala retrovirus, but researchers are working to test a vaccine that would help prevent further spreading of chlamydia.
A study published in 2010 in The American Journal of Reproductive Immunology found that this vaccine is safe and effective in healthy female koalas. Further work is being done to test it in koalas that are already infected. Peter Timms, a professor at the Queensland University of Technology who is leading the effort to test the chlamydia vaccine, is hopeful that there will be another trial this year to test it in captive male koalas, followed by wild koalas. If all goes well, plans can be set in motion to distribute the vaccine.
Many experts believe this vaccine would be an important step in helping koalas survive longer, perhaps buying enough time for researchers to solve some of the other problems they face. "In situations where you combine habitat pressure, domestic dog attacks and car hits with severe chlamydial disease, the outcome for koalas is devastating," Dr. Gillett said.
As researchers have found, the bacteria, chlamydia______.
选项
A、will spread from koalas to humans
B、will cause symptoms in all infected koalas
C、is exclusively confined to koalas
D、is transmittable to other animals
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/JecO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
Thatuniversityhasproducedalargenumberofsocialcelebrities,includingfourPresidentsandthreeSpeakers.
Howtodisposeofnuclearwasteisaninternationalissuecloudedbycontroversy.
Americans’ParadoxicalBehaviorOneofthegeneralitiesmostoftennotedaboutAmericansisthatwearearestless,adissati
Sincethestartingofthe21stcentury,therehaveappearedmoreandmorepeoplewhoaresimply______,talkingnonsenseandtwi
AttheendofarecentfeastatRestaurantRevolutioninNewOrleans,Iorderedacupofhotteaandwaspresentedwithanelega
Onceyouhavefinishedreadingthesedocumentsfromourconsultant,wewouldliketohaveyouropiniontoberegardedthevalue
Theoldcouplenowstillgrievefortheirbelovedson,30yearsafterhisdeath.
核安全核能自诞生之日起,对人类的经济社会产生了积极作用。但人们也看到,核能应用存在巨大风险。福岛核泄漏事故后,一些国家开始限制和放弃核能的开发和使用。而中国的立场是,在接下来相当长的时期内,核能仍是我们确保能源安全,保障经济社会发展,应
A、Carolusedtobeanurse.B、Carolpreferstobeanurse.C、Carolnowworksasateacher.D、Carolwishesshewereateacher.D
A、Two.B、Three.C、Four.D、Five.B
随机试题
有以下程序#include<stdio.h>main(){charc[2][5]={"6938","8254"},*p[2];inti,j,s=0;f
何谓肝脏假小叶?其形态结构如何?
依据我国《担保法》规定,下列财产不可以抵押的是()。
属于民族文化遗产的有()。
《建设工程施工合同》规定的设计变更范畴不包括( )。
引起个别投资中心的投资利润率提高的投资,一定会使整个企业的剩余收益增加。()
经济活动的参与者是分散的,各自独立,信息不全,结果必然造成经济波动和资源浪费。这反映出市场调节的哪一项缺陷?()
图16-4标出了某地区的运输网:各节点之间的运输能力如表16-10所示(单位:万吨/小时):从节点①到节点⑥的最大运输能力(流量)可以达到(65)万吨/小时。
Americanseat_______________(两倍多的蛋白质)theyactuallyneedeveryday.
A、Aprojectaboutanactress.B、Aprojectaboutamoviedirector.C、Aprojectaboutamovie.D、AprojectaboutEurope.AWhatar
最新回复
(
0
)