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
2018-08-25
27
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
【C1】
选项
答案
O
解析
空格在指示代词that之后,应为名词。that所指与上一句内容有关,指“去沙滩之前先涂上防晒霜”。此处应选择option,表示海洋动物“没有那样的选择”。mechanism通常用于指事物本身内在的机制,不适宜用于指代“涂防晒霜”,故排除。
转载请注明原文地址:https://kaotiyun.com/show/iTH7777K
0
大学英语六级
相关试题推荐
RisingInequalityIsHoldingBacktheU.S.Economy[A]Inannouncinghisrunforthepresidencylastmonth,JebBushhassetan
Attentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahuman-resourceexp
Attentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahuman-resourceexp
Attentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahuman-resourceexp
Attentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahuman-resourceexp
A、Everyoneshouldadmitthattheyhaveenemies.B、Humblepeoplehavefewerenemies.C、Itisterribletohaveenemies.D、Generous
It’sagoodideatoapplysunscreenbeforeheadingtothebeachifyoudon’twanttoburn.Butformarineanimalslikewhales,t
Drought,tsunami,violentcrime,financialmeltdown—theworldisfullofrisks.Thepoorareoftenmost【C1】______totheireffect
Drought,tsunami,violentcrime,financialmeltdown—theworldisfullofrisks.Thepoorareoftenmost【C1】______totheireffect
Wesometimesthinkhumansareuniquelyvulnerabletoanxiety,butstressseemstoaffecttheimmunedefensesofloweranimalsto
随机试题
求曲线y=lnx在区间(2,6)内的一点,使该点的切线与直线x=2,x=6以及y=lnx所围成的平面图形面积最小.
目前,我国国家标准由()发布。
债务人以非现金资产抵偿债务时,应将重组债务帐面价值小于抵债非现金资产帐面价值及相关税费的差额,计入()。
新参加工作的员工,从参加工作的()开始缴存住房公积金。
新民主主义的前途是()。
拘留既适用于自然人,又适用于法人。( )
看过《西游记》小说的人在头脑中都可以形成孙悟空的形象。这是()的心理活动。
______不属于声波的物理属性与相应的心理特性。()
试比较三种传统心理物理法的优缺点。
无符号二进制整数101001转换成十进制整数等于__________。
最新回复
(
0
)