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
2024-03-31
27
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] 【C7】
选项
答案
K
解析
空格在less和介词of之间,应为名词。本段主要讲皮肤黑色素(melanin)含量的多少决定mtDNA受损的程度。填入空格的词应与amount近义,content“含量”符合句意。
转载请注明原文地址:https://tihaiku.com/zcyy/3534267.html
相关试题推荐
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That’sb
[originaltext]Milkwasabasicfoodofmanlongbeforehistorywaswritten.
[originaltext]Milkwasabasicfoodofmanlongbeforehistorywaswritten.
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
Accustomedthoughwearetospeakingofthefilmsmadebefore1927as"silen
[originaltext]Iamfiredupfortheyearthatstretchesoutbeforeus.That
随机试题
Theinterview—about3minutesInthispartinterlocutorasksquestionstoeacho
Dostrongelectriccurrents,bymeansoftheelectromagneticfieldsthataccompa
theinvestorwhoisuncertainaboutthefutureismorelikelytoputmoneyinto
[img]2012q1/ct_etoefm_etoefspeakc_0118_20121[/img]Describethewoman’sprobl
Latelyithasbecomepopulartorejecttheadviceofdrinkingeightglasses
在糖尿病筛检中检测血糖的目的是()A.查出隐性的糖尿病患者 B.查出糖耐量减
急性肝炎时,LD同工酶的特点是A.LD3↑ B.LD1↑ C.LD4↑ D
A.国家基本药物 B.上市药品 C.处方药 D.仿制药品 E.国家基本药
下列关于房地产价格影响的表述中,正确的是()。A.在卖方市场下,增加卖方的
根据《污水综合排放标准》,以下允许在排污单位排放口采样的污染物是( )。A.总
最新回复
(
0
)