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
It’s a good idea to apply sunscreen before heading to the beach if you don’t want to burn. But for marine animals like whales, t
It’s a good idea to apply sunscreen before heading to the beach if you don’t want to burn. But for marine animals like whales, t
admin
2016-04-30
38
问题
It’s a good idea to apply sunscreen before heading to the beach if you don’t want to burn. But for marine animals like whales, they don’t have that【C1】______Species like sperm whales can spend up to six hours at the ocean’s surface in between dives,【C2】______in the sunlight. So how do they protect themselves from a serious case of sunburn?
It turns out that their bodies have a similar defense【C3】______against the sun’s UV radiation as people. Blue whales—which have the lightest skin color of the three species—tan during their summer stay before【C4】______, back to their northern feeding grounds. Sperm whales don’t tan. They can receive an "overdose" of UV radiation during their hours at the ocean’s surface, and they have proteins that【C5】______protect their cells from UV damage. This process is【C6】______to how human bodies produce antioxidants in response to molecules that can cause a lot of genetic and cellular damage. And fin whales escape sun damage thanks to their high levels of melanin—a dark substance in the skin to protect humans from UV radiation.
Older whales and whales with less【C7】______of melanin in their skin—like blue whales—had the greatest level of damage in their mtDNA. Fin whales, which had the greatest amount of melanin, had the least amount of mtDNA damage.
Now that the ozone layer that shields Earth from UV radiation is gradually【C8】______it’s important to know what the consequences are for whales and dolphins, especially for【C9】______or endangered species. Although it’s difficult to tell what causes many of these skin conditions, UV damage is one cause. Even though whales have【C10】______defenses to UV radiation, high exposure can still be harmful.
A)similar B)diminishing G)liability D)migrating
E)mutual F)mechanism G)effectively H)jerking
I)instantaneously J)vulnerable K)content L)baking
M)inherent N)perspective O)option
【C3】
选项
答案
F
解析
虽然空格前的defense是名词,但从句宾语部分意思仍未完整,因此空格应该还是名词,被defense修饰作句子宾语。此处应选mechanism,表明鲸鱼自身拥有防晒的“保护机制”。
转载请注明原文地址:https://kaotiyun.com/show/4NG7777K
0
大学英语六级
相关试题推荐
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterprise.It’s【B1】______economyinwhichconsumersdeterm
A、AwarbetweenBritainandtheUnitedStates.B、AsmallbattlebetweentheAmericanandtheBritishtroops.C、TalksbyGeneral
A、Walkingthedog.B、Cuttingthegrass.C、Takingcareofthechildren.D、Feedingthefish.C细节题。Marsha照看房子的时候要修剪草坪,给植物浇水,Eric托管房
TheHealthBenefitsofDrinkingWater—IsBottledDrinkingWaterHealthierThanFilteredTapWater?A)Waterisakeyin
Whensomebodycalls,firstofall,the【B1】______wouldofferhimacigaretteandacupoftea.Inthecountryside,【B2】______.old
Whensomebodycalls,firstofall,the【B1】______wouldofferhimacigaretteandacupoftea.Inthecountryside,【B2】______.old
A、Shepaidbycheck.B、Shedecidedtomakethepurchase.C、Shepaidbycreditcard.D、Sheleftwithoutpaying.C推理题。女士问男士是否接受个人支
WriteacompositionentitledTalentShow(选秀节目).Youshouldwriteatleast150wordsbutnomorethan200wordsaccordingtothe
A、Becauseofthestressfactors.B、Becauseoftheleisureactivities.C、BecauseoftheTVwatching.D、BecauseofthegeneralAme
随机试题
论述专利取得中的先申请原则。
肥大细胞主要参与
必须进行药品集中采购的药品是
A、羌活B、前胡C、白芷D、南沙参E、北沙参体轻,质松泡,上部多有深陷横纹,呈断续的环纹的药材为
企业可以通过股票投资实现对其他企业的控股或参股,也可以将暂时闲置的资金通过自营或委托专业机构进行证券投资以获取收益。( )
按提供服务的种类划分,第三方物流企业分为()。
世界七大古迹之一的亚历山大灯塔遗迹位于埃及的()。
下列生活常识说法正确的有:
对长度为10的线性表进行冒泡排序,最坏情况下需要比较的次数为
SpeakerA:Whatseemstobetheproblemwiththeblouse,miss?SpeakerB:______
最新回复
(
0
)