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
43
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、Awaytopreventabonedisease.B、Anunderstandingbetweenbonetissueandothertissue.C、Awaytounderstandhowspecialize
A、Itisbasedontheinterviewswithpopularsingers.B、Itistointroducesomefamoussongwriters.C、Ithelpstounderstandthe
A、Toexplainitsspecialtyandfunction.B、Toshowshallow-wateranimalsarealsoamazing.C、Toexplainhowanimalsadapttosur
TowardstheendofJune,auniquejointexpeditionbeganinthewatersnearIndonesia.Inanareaofremarkablemarinediversity
A、Studyintensivelybeforeatestforevenashortperiod.B、Don’tworryaboutyourEnglishlevelifyouworkhard.C、UseTOEFL
A、Theycanlearntheirfuturemajorinanotherlanguage.B、Theycancommunicatewiththeirclassmatesfreely.C、Theycansucceed
A、1monthbeforemovingout.B、2monthsbeforemovingout.C、6monthsbeforemovingout.D、Atthetimewhenmovingout.A
Whenfisherieshavesunkorcollapsed,oneapproachtofixthesituationistosetupamarinereservewherefishingisbanned.
Whenfisherieshavesunkorcollapsed,oneapproachtofixthesituationistosetupamarinereservewherefishingisbanned.
随机试题
为确保建设工程进度控制目标的实现,监理工程师必须认真制定进度控制措施。进度控制的技术措施主要有()。
下列明细分类账中,应该采用数量金额式明细分类账的是()。
下图是国家统计局企业景气指数分行业中工业的季度数据,时间区间为2001年1月至2016年9月。根据图表,工业企业负责人对经营状况和经济预期最悲观的时间是()。
下列关于乳类脂肪的描述,不正确的是()。
赵女士长期以来忍受丈夫的家庭暴力。这天,因饭菜不合口味,丈夫动手打了赵女士耳光,赵女士刚辩解几句,丈夫用绳子将其勒得喘不过气,并用刀将她的手臂砍伤。邻居们闻声冲开门把赵女士救了下来并请来了社会工作者。面对这种情况,社会工作者首先应该()。
以下①~⑦种教师行为中,违反教师职业道德及有关政策法规的是()①按名次排座位;②作业完不成,罚站一星期;③当众嘲笑,羞辱学生;④对犯错误的学生进行适当的惩戒;⑤教师辅导自己班的学生并收费用;⑥因为找不到违反纪律的某个学生,就将全部同
人类的和平共处是一个不可实现的理想。统计数字显示自1945年以来每天有12场战斗在进行,这包括大大小小的国际战争以及内战中的武力交战。以下哪项如果为真,最能对上述结论提出质疑?
开发策略的制定必须考虑很多问题,但下面()的问题可以不考虑。
表达式12/2\4的值是
支持子程序调用的数据结构是()。
最新回复
(
0
)