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] The passage is primarily concerned with ______.
选项
A、informing readers of different sea creatures
B、describing predatory microscopic organisms
C、solving some long-lasting mysteries about the sea
D、discussing the environment for various fishes
答案
B
解析
主旨题型通读全文可知本文第一段是本文的主旨:讲的是a scientific fact:Microscopic organisms are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick too. 因此整体讲的是Microscopic organisms, B为答案。(第一段讲的是:听上去像一篇科幻小说,但研究人员说这是一个科学事实:一种绰号为“藻类杀手”的微观生物用一种不知名的(生物)毒素麻痹鱼类,然后食用它们的肉。它们也可能会使人类得病。)
转载请注明原文地址:http://tihaiku.com/zcyy/3310527.html
相关试题推荐
Artificialflowersareusedforscientificaswellasfordecorativepurpose.
Artificialflowersareusedforscientificaswellasfordecorativepurpose.
Artificialflowersareusedforscientificaswellasfordecorativepurpose.
Partofhersuccesssoundspedestrian:puttinginexceptionallylonghourstoge
Modernscienceandtechnologyhasmadeitconvenientcommunicationbetweenpeopl
Chronobiologymightsoundalittlefuturistic—likesomethingfromascience
Chronobiologymightsoundalittlefuturistic—likesomethingfromascience
Chronobiologymightsoundalittlefuturistic—likesomethingfromascience
Chronobiologymightsoundalittlefuturistic—likesomethingfromascience
Chronobiologymightsoundalittlefuturistic—likesomethingfromascience
随机试题
Doctorsbelievethatlungcanceriscaused______bysmokingtoomuch.A、partB、a
Mostpeopledon’twakeupinthemorning,combtheirhair,andwalkoutthe
[originaltext]M:I’dliketomailthispackagetoMinneapolis.W:Howwouldyou
Afacialexpressionresultsfromoneormoremotionsorpositionsofthemus
[originaltext]W:(17)Whichsocialproblemdoyouthinkthegovernmentneedstoc
2012年,习近平同志访美后再度掀起的美国地方政府“中国热”也一再表明,地方交流
电子商务技术支持的4个层次中,()能够提供格式化数据交流和非格式化数据
图所示刚架的自振频率为( )。
三角形板ABC受平面力系作用如图示。欲求未知力FNA、FNB和FNC,独立的平衡
进行心理测验时,施测者的做法不恰当的是A.与受测者建立良好的协调关系 B.避免
最新回复
(
0
)