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
60
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:http://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
YouareinterestedinClassicalMusic,soyoucanwatchTVat______.[br]Ifyo
A.consciousB.InsteadC.tricksD.MoreoverE.actualF.exceededG.backward
2019年8月18日,冰岛为澳克冰川(OkjokullGlacier)的消逝举行了纪念仪式。冰岛大学在2017年发布的一份报告称,【T1】1890年
Whateffectdoesjoblessnessandcutsinpublicassistancehaveonchildrenofs
A.selflessB.builtC.complexD.butE.executeF.sustainedG.cheate
[originaltext]Didyoueverhavesomeone’snameonthetipofyourtonguean
处在统一划分层次上的不同类目的关系是指()。A.相关关系 B.交替关系 C
看到幼儿园的玩具汽车,丽丽告诉老师:“这汽车跟我家的一样”,这种心理现象是()A
以下不属于个人教育贷款支付管理中的风险的是( )。A.未详细记录资金流向和归集
位于市区的某自营出口生产企业,2021年3月增值税应纳税额为-280万元,出口货
最新回复
(
0
)