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
2018-05-11
47
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 C) 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
【C6】
选项
答案
A
解析
根据空格后面的内容“人体如何产生抗氧化剂以应对造成大量遗传细胞损伤的分子”可知,本句类比了抹香鲸和人类自身的防护机制,故填入空格的词应含“类似”的意思,similar符合句意。
转载请注明原文地址:https://kaotiyun.com/show/P4T7777K
0
大学英语六级
相关试题推荐
A、Amapofloop.B、Photosofseaanimals.C、Twopipesforplaying.D、Amusicbox.B根据录音,名为“SoapBubbleSet”的作品里包含了一些海洋生物的照片,故答案
A、WhenthePresidentandtheFirstLadydancedintheWhiteHouse.B、WhenanoldslavewasinterviewedaboutAmericanBlackHist
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand1
A、Verynormalinthe21stcentury.B、Absolutelycorrectforever.C、Profoundlywrongfornow.D、Rattierabsurdinthe19thcentur
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
A、Theypresentthewaystobemoreproductive.B、Theytellustobemorephysicallyhealthy.C、Theyfocusontheimportanceofh
A、Theworldislackofconsumption.B、Foodandresourcesarenotenough.C、Somecountrieswanttohavesmallpopulation.D、Human
A、Aphenomenonofagingfacebecauseoffacingcomputerforlong.B、Afeatureofscreen-shapefacebecauseofpeoplefollowingf
Drought,tsunami,violentcrime,financialmeltdown—theworldisfullofrisks.Thepoorareoftenmost【C1】______totheireffect
随机试题
下列对象可制作形状补间动画的是()。
甲有天然奇石一块,不慎丢失。乙误以为无主物捡回家,配以基座,陈列于客厅。乙的朋友丙十分喜欢,乙遂以之相赠。后甲发现,向丙追索,下列选项中哪一个是正确的()
高钾血症和低钾血症相同的临床表现或实验室检查是
(2011年)流速场的势函数φ=5x2y2-y3,则其旋转角速度()。
工程造价的编制步骤中,划分工程子目的紧后工作是()。
选择卡片号为1502的固定资产变动单,生成记账凭证。
《中华人民共和国税收征收管理法》规定,下列单位中,应向税务机关申请办理开业税务登记的有()。
首次公开发行股票并上市的公司,以下情形对其独立性不构成实质影响的是()。[2014年6月真题]
某校园网采用RIPvl路由协议,通过一台Cisco路由器R1互连2个子网,地址分别为213.33.56.0和213.33.56.128,掩码为255.255.255.128,并要求过滤g0/1接口输出的路由更新信息。那么R1正确的路由协议配置是()
Theuseofonenameforthatofanotherassociatedwithitisrhetoricallycalled_____
最新回复
(
0
)