首页
登录
职称英语
It’s a good idea to apply sunscreen before heading to the beach if you don’t
It’s a good idea to apply sunscreen before heading to the beach if you don’t
游客
2023-08-11
54
管理
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 [br] 【C9】
选项
答案
J
解析
or提示填入空格的词可能是形容词或分词,与endangered并列;也可能是名词,与species并列。词库中的名词放人句中,句意不通。形容词vulnerable符合句意,表示逐渐减小的臭氧层对“脆弱的”物种会产生特别严重的影响。
转载请注明原文地址:https://tihaiku.com/zcyy/2918009.html
相关试题推荐
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That’sb
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That’sb
[originaltext]Milkwasabasicfoodofmanlongbeforehistorywaswritten.
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That
随机试题
Someconsumerresearchersdistinguish(1)"rational"motivesand"emotional"
TheexecutivedirectorofTransparencyInternationalKenyanwasdismissedbecaus
[originaltext]LastSunday,hugewavesmovedacrosstileIndianOceanandflo
[originaltext]W:Hey,what’sthenews?(12)Youlooksohappy.M:Really?W:Come
下列属于梅奥人际关系理论观点的是A.劳动方法标准化能大幅度提高劳动效率 B.平
根据合同法律制度的规定,借款人提前偿还贷款的,除当事人另有约定外,计算利息的方法
A.AB.BC.CD.D
Thechangeinthatvillagewasmiraculou
区别轻症肺炎与重症肺炎的重要依据是A、年龄大小 B、呼吸困难程度 C、肺部啰
习近平总书记指出,世界正处于百年不遇的大________之中,经济仍在艰难复苏,
最新回复
(
0
)