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
What’s Killing the Bats First it was bees. Now it is bats. Biologists in America are working hard to discover the cause of t
What’s Killing the Bats First it was bees. Now it is bats. Biologists in America are working hard to discover the cause of t
admin
2015-06-19
77
问题
What’s Killing the Bats
First it was bees. Now it is bats. Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country. Most of the bats affected are the common little brown bats ( Myotis lucifugus,) but other species, such as the long-eared bat, the small-footed bat, the eastern pipistrelle, and the Indiana bat have also been affected. In some caves, more than 90 percent of the bat populations have died.
One possibility is disease. A white fungus (真菌) known as fusarium has been found on the noses of both living and dead bats. However, scientists don’t know if the fungus is the primary cause of death, a secondary cause of death, or not a cause at all, but the result of some other conditions.
Another possible cause is a lack of food. For example, bats typically eat a large number of moths (蛾) , and in some states such as New York, the number of moths has been declining in recent years. If bats can’t eat enough food, they starve to death.
Still other scientists believe that global warming is to blame. Warmer temperatures in recent years have been waking up hibernating (冬眠) bats earlier than usual. If bats break their hibernation at the wrong time, they might not find their expected food sources. The weather might also turn cold again and weaken or kill the bats.
Scientists might not agree on the causes of the bat die-off but they do agree on the consequences. Bats are an important predator of mosquitoes:a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops. If there aren’t enough bats, damage will be great from the insects they eat. While bats live a long time for their size—the litde brown bat can live for more than 30 years—a female bat has only one baby per year, so bat populations grow slowly. Many bat species in the United States are already protected or endangered.
How can you help? Do not disturb sleeping or nesting bats. If you discover bats that seem to be sick or that are dead, contact your local Fish& Wildlife Department with the details. However, be careful not to touch the animals.
What is the main idea of this passage?
选项
A、All species of bats in North America are dying.
B、Scientists already know the cause of the deaths of bats.
C、The bat deaths are a serious problem.
D、There are many possible causes of the deaths of bats.
答案
C
解析
主旨大意题。文章前四段讲述的都是可能造成蝙蝠死亡的原因,但在第五段回归到了蝙蝠死亡导致的严重结果上——严重损害农作物。而在最后一段讲述的是如何帮助减少蝙蝠死亡。归根究底,作者是在讲述蝙蝠死亡的严重问题。故本题故选C。
转载请注明原文地址:https://kaotiyun.com/show/vIGd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
ThemethodusedbytheColumbiaUniversityresearcherscanpredictElNinoafewmonthsinadvance.Ittakesabouteightmonths
Studentsworkingtowardadegreeinbusinessarelikelycandidatesforcareersinthebankingindustry.
HowtoEducateChildrenAsEleanorRooseveltoncesaid,“Universalhumanrightsbegininsmallplaces,closetohome.”And
Thestudyshowedthatmostofthegirls______.Unhealthyattitudesaboutweight,bodyimageandfoodmay______.
Thestudyshowedthatmostofthegirls______.Whatkindofinstitutiondoestheleadresearcherworkwith?
Firsteditionsofcertainpopularbookscannotbeobtainedforloveormoney.
HowtoSpentHisExtraTimeGiventhechoicebetweenspendinganeveningwithfriendsandtakingextratimeforhisschoolwo
TakingaNapduringtheDayMedicalexpertssaymostAmericansdonotgetenoughsleep.TheysaymoreAmericansneedto【51】
AmericanscientistspredictedthatMountSaintHelenswastoeruptsoon.TheeruptionofMountSaintHelensattractedalargen
随机试题
A.K-K反应B.Ravmond反应C.Hcl-Mg粉反应D.Liebermann-Burchard反应E.Gibb反应鉴别α-去氧糖的反应是
A、四逆汤B、当归四逆汤C、回阳救急汤D、右归丸E、大建中汤手足厥寒,舌淡苔白,脉沉细者,治疗应选用
下列除哪项外,均与脂瘤无关()
A山茱萸B桑螵蛸C莲子肉D诃子E金樱子具有补脾止泻,养心安神功效的药物是()
证券公司可以在客户资产管理业务范围内为客户办理()。Ⅰ.定向资产管理业务Ⅱ.特定目的的专项资产管理业务Ⅲ.集合资产管理业务Ⅳ.其他资产管理业务
资本公积经批准后可用于派发现金股利。()
爱尔兰有大片泥煤蕴藏量丰富的湿地。环境保护主义者一直反对在湿地区域采煤。他们的理由是开采泥煤会破坏爱尔兰湿地的生态平衡,其直接严重后果是会污染水源。然而,这一理由是站不住脚的。据近50年的相关统计,从未发现过因采煤而污染水源的报告。以下哪项,如果
右图是一个长方形花坛,阴影部分是草地,空地是四块同样的菱形,求草地与空地的面积之比。()
增加复合嵌体的固位措施有()。
某公司某个部门的人员都参加了MBA考试,关于他们的考试结果有如下判断:(1)此部门不可能有人没通过。(2)此部门的小芳以高分通过。(3)此部门有的人没通过。(4)并非此部门所有人都没有通过。假设上述断定只有两个是对的
最新回复
(
0
)