首页
登录
职称英语
It sounds like a science fiction, but researchers say it’s a scientific fact
It sounds like a science fiction, but researchers say it’s a scientific fact
游客
2023-12-27
35
管理
问题
It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack. [br] Which of the following questions is answered according to the information given in the passage?
选项
A、What is the toxin used by the fish killer?
B、Who first discovered the organism?
C、How does the fish killer paralyze fish?
D、How many fishes can the organism kill each day?
答案
C
解析
是非题型第一段中提到the fish killer有toxins,但没提它使用何种toxins,排除选项A;第二段中提到the fish killer于1988年在大学被发现,但没提及是谁发现的,排除选项B;选项D在文中没有提及;因此C为答案(在第三段第二句中谈到the fish killer向水中、空气中释放神经毒素,麻痹了鱼类的神经系统,使得鱼类钻到水面呼吸;最终鱼类窒息而死;然后它就附着于鱼身食其肉)。
转载请注明原文地址:https://tihaiku.com/zcyy/3310533.html
相关试题推荐
Theresearchersfoundtherearethousandsofgeneticdifferenceslinkedtosame-
Withtheadvancementofscience,scientistsareabletofindoutthepathsofst
ResearchershavefoundthevirusincivetcatsatalivefoodmarketinChina,b
Inthepastfewyears,I’vetaughtnonfictionwritingtoundergraduatesandg
研究人员认为父亲语言上的差异可能是“研究一致发现女孩在学业成绩上优于男孩”的原因。(discrepancies)Researchersbelievethat
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
随机试题
Inthesummerof2010,record-hightemperatureshitMoscow.Atfirstitwasj
Airpollutionisoneofthemostpervasiveenvironmentalproblemsbecauseat
ForgetexpensiveeducationalDVDsandprivatetutors,thesecrettosmartch
arcsinx+C
下面哪两个指标具有相同的经济意义,可以相互补充( ).A.资产负债率与产权比率
2001年、2002年全国高等学校各学科学生数(单位:千人) 2001年
A.还原型谷胱甘肽 B.多烯磷脂酰胆碱 C.异甘草酸镁 D.双环醇 E.
下列各项中,可以作为胶浆剂的是()。A.桂皮糖浆 B.山梨醇 C.羧甲
下列关于债券价值与折现率的说法中,正确的有()。A.报价利率除以一年内复利
甲公司向乙公司签发一张纸质商业承兑汇票,完成承兑后下列关于该汇票办理票据信息登记
最新回复
(
0
)