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
2019-06-23
89
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/EjX7777K
0
大学英语六级
相关试题推荐
A、Theyclusteredincaves.B、Theytraveledingroups.C、Theyhadarefinedlanguage.D、Theyfedmostlyonfruit.A①所有选项都围绕“他们”,注
A、Heshouldstartwithalightworkout.B、Heshouldgotohaveacheck-up.C、Heshouldeatlessfattyfoods.D、Heshouldvisita
A、Itisbasedontheinterviewswithpopularsingers.B、Itistointroducesomefamoussongwriters.C、Ithelpstounderstandthe
Afterdecadesofdecline,theshareofmotherswhostayhomewiththeirchildrenhas【C1】______risenoverthelastseveralyears
Afterdecadesofdecline,theshareofmotherswhostayhomewiththeirchildrenhas【C1】______risenoverthelastseveralyears
A、Nothingbutthedarkness.B、Firefliesblinkingeverywhere.C、Aworldoflightinganimals.D、Wreckageofancientships.C录音开头演讲
A、TOEFListhemostgloballyusedlanguageassessmentexam.B、TOEFLscoresmatteralotingettingfinancialaids.C、AllAmerica
A、Hecanspeakthreeforeignlanguages.B、Hedislikeshisjobverymuch.C、Heisthinkingaboutchanginghisjob.D、Heknowslit
A、Reachingonlynineteenpercentoftheworld’spopulation.B、Neglectingagreatmajorityoftheworld’slanguages.C、Havingtoo
随机试题
A.肉豆蔻B.赤石脂C.罂粟壳D.浮小麦可用于肺虚久咳、心腹诸痛的药是
下列哪项不是卵巢巧克力囊肿的分型
寒湿痢治以素体阴虚,久痢不愈,余邪未尽,阴虚作痢,宜选
气雾剂中的潜溶剂片剂薄膜包衣中的增塑剂
A.蹄裂B.白线裂C.蹄叶炎D.蹄叉腐烂E.蹄冠蜂窝织炎马,4岁,体温40.1℃,四肢蹄冠先后出现圆枕形肿胀,触诊有热、痛,支跛。根据临床表现诊断所患蹄病是()
当事人申请劳动仲裁,仲裁庭受理后在作出裁决前,可以先行调解。()
根据消费税法律制度的规定,下列关于消费税纳税地点的表述中,正确的是()。
背水一战:韩信:西汉
家庭关系的核心是
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
最新回复
(
0
)