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
A、There is more interest in preserving songbirds in urban areas. B、There are altogether 113 species of birds in the city of Edmo
A、There is more interest in preserving songbirds in urban areas. B、There are altogether 113 species of birds in the city of Edmo
admin
2016-12-26
19
问题
The rising level of noise in urban areas may be preventing some species of songbirds from setting up home in developed areas, a study has concluded.(19)Canadian researchers found that noisy surroundings masked the lower frequencies of bird songs, affecting the way some species communicated.(21)Unable to hear all elements of a song, females could perceive singing males as ill-suited mates, they added. There has been a growing interest in preserving or increasing the biodiversity of songbirds in urban areas. This leads to the investigation on whether there was a link between bird diversity and noise levels. Dr. Proppe is a professor of Calvin College. His team surveyed species at 113 sites in natural areas within the city of Edmonton.(20)They found that the number of species at each location tended to be lower when noise levels were higher. The decrease in species richness was one of the study’s major findings. The study also focused on seven species that did inhabit the area to see if their abundance was affected as the urban noise increased.
What they found is that three of the species did have lower abundances in locations that were noisier.(21)Dr. Proppe suggested that females may perceive the song as abnormal if they could not hear the lower frequencies. If the adults stop pairing and mating, then the number of offspring would decrease as a result. Over a period of time, this could have a potential impact on the abundance of the species.
19. How does the urban noise affect the communication of birds?
20. What did Dr. Proppe’s team find?
21. Why do some birds stop pairing and mating in some urban areas?
选项
A、There is more interest in preserving songbirds in urban areas.
B、There are altogether 113 species of birds in the city of Edmonton.
C、The higher the noise levels are, the less species of birds there are.
D、The increase in species richness is higher in natural areas.
答案
C
解析
短文中指出,Proppe的研究小组发现,当噪音水平上升时,鸟类的种类数量会有所下降。由此可知,噪音水平上升,鸟类物种减少。
转载请注明原文地址:https://kaotiyun.com/show/1zi7777K
0
大学英语四级
相关试题推荐
Halfacenturyago,mostpeoplelivedinruralareas.However,accordingtothemostrecent【B1】______projectedbytheUnitedNat
A、Theyarethrownawayafterbeingused.B、Theywillbebuiltinfuture.C、Theycanbeusedforabout5years.D、Theycanbebui
A、Itmeanstheyearyoutakeoffandyou’llcontinueschoolwithenoughmoney.B、Itmeanstheyearyouhaveoffbetweenhighsch
A、ItneedstohavemoreFrenchlessontapes.B、Itneedstohaveitscontrolsrepaired.C、Itisdifferentfromalltheotherlabo
A、Theyshouldbeburiedlyingdown.B、Theyshouldbeburiedstandingup.C、Theyshouldbeburiedafterbeingwashed.D、Theyshou
CreativeDestructionofHigherEducationA)Highereducationisoneofthegreatsuccessesofthewelfarecountry.Whatwasonce
Onlyhalfofwomenactuallyenjoybeingpraisedandmanyothersmisinterpretwell-meantwords,asoffensive,accordingtoanew
NewYear’sresolutionsoftenhavetodowitheatingmorehealthfully,goingtothegymmore,losingweight—alladmirablegoalsa
A、Thepricesofhouseswillnotfalloff.B、Humansmayhavechancestomeetmonsters.C、Hebelievesintheexistenceofmonsters
随机试题
Inwinter,mostanimalshaveahardtime________anythingtoeat.
下列关于信息的说法正确的是()
保兑信用证支付方式中,负第一性付款责任的有
试述婚姻自由原则。
急性浆液性根尖周炎与急性浆液性牙髓炎主要区别点包括
若已知土压力Ea=50kN/m,土对挡土墙基底的摩擦系数μ=0.4,挡土墙自重G=200kN/m,则挡土墙的抗滑移系数K与下列何值最为接近?[2010年第126题]提示:根据公式K=Gμ/Ea。
在众多激励理论中进一步改进了马斯洛需要层次理论并提出“挫折—退化”观点的是()。
下列各项建筑物中,不属于房产税征税范围的有()。
教师在充分了解幼儿已有知识和理解能力、智力水平的基础上,提出“略为超前”的适度教育要求,即“跳一跳、摘个桃”,这体现了学前教育原则中的()
George______someimportantsentencesbyunderliningthemwitharedpen.
最新回复
(
0
)