首页
登录
职称英语
In many parts of the world, alien species are harming the environment and ca
In many parts of the world, alien species are harming the environment and ca
游客
2023-10-19
11
管理
问题
In many parts of the world, alien species are harming the environment and causing other problems. An alien species is a species of plant or animal that has moved from its original home to a new area. Sometimes people have intentionally introduced the new species; sometimes it arrives accidentally, as a side effect of international trade. In its new location, the alien species has no natural enemies, so it can grow and multiply without limit. Over time—sometimes decades, sometimes a few years—the new species takes living space and food away from the native plants and animals. The result can mean drastic change in the natural landscape and problems for people.
The tiger mosquito is an example of an alien species. This kind of mosquito is common in Asia, but in recent years it has moved to parts of southern Europe. Scientists believe that the eggs of this insect probably arrived inside some car tires that were filled with water. In a few years, the mosquitoes multiplied and spread over large areas of Italy and other countries. Tiger mosquitoes can reproduce faster than common European mosquitoes, so they quickly replaced a large percentage of the native mosquitoes. Though they don ’ t cause serious disease in humans, tiger mosquitoes are a serious nuisance. They are far more aggressive than common European mosquitoes, and the effects of their bites are worse.
Another example of a different kind of animal that has recently moved to another continent is the zebra mussel. This small shellfish was first discovered in the Great Lakes of North America in 1986. It may have come over from Rvrssia on a cargo ship. In a very few years, zebra mussels had spread over all the Great Lakes and into many important rivers. They have grown into thick masses, covering many areas of lakes or river bottoms. They have also covered and closed up pipes of power stations and water treatment centers.
Among the many examples of alien species of mammals that have caused damage is the Indian mongoose. This animal was brought to Hawaii in the 1800s to kill rats in sugarcane fields. Since then, they have grown in numbers so that today they are a major threat to bird life on the islands. One of the mongoose’ s favorite foods, in fact, is birds’ eggs. Thus, the mongoose has caused great damage to poultry farmers in Hawaii, and it has greatly reduced the numbers of many native bird species. Many of these species, which are unique to the islands, are now at risk of extinction. [br] What is the difference between tiger mosquitoes and common European mosquitoes?
选项
答案
Tiger mosquitoes are far more aggressive and reproduce faster than common European mosquitoes.
解析
文章第二段倒数第三句和最后一句提到,老虎蚊子的繁殖速度比普通的欧洲蚊子更快,所以它们很快就取代了大量的本土蚊子。并且它们比普通的欧洲蚊子更具攻击性,被叮咬后后果更严重。由此可知本题答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3111984.html
相关试题推荐
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofco
PASSAGEONE[br]Whyisthedescriptionofthepastnaturalenvironmentimportan
Iamgoingtoworkinatotallynewenvironment.【T1】________.Iamusedtow
Iamgoingtoworkinatotallynewenvironment.【T1】________.Iamusedtow
Iamgoingtoworkinatotallynewenvironment.【T1】________.Iamusedtow
随机试题
下列中国古代小说,属于“四大奇书”的有()A.《三国演义》 B.《西游记》
“数百年来,人类不断向深海领域进军,到目前为止,人类所探测到的海洋最深的地方是位
一患者因胃部不适行上消化道造影,显示胃部充盈缺损,内镜检查可见胃黏膜局限性隆起,
喉烧伤的正确分型是A.仅有声门区以上黏膜损伤为轻型,有声门区以下黏膜损伤为重型
A公司中标某客户业务系统的运行维护服务项目,服务期从2018年1月1日至2018
下面几个关于样本均值分布的陈述中,正确的是() Ⅰ.当总体服从正态分布时
Paragraph2_____A.Drysteamplants B.Bin
以下关于矩阵制组织结构的叫法不正确的是()。A.长期固定性组织结构 B.
A.蒺藜 B.地龙 C.蜈蚣 D.石决明 E.青黛能平肝潜阳的药是
财产税具有的优点包括()。A.属于直接税,税负不易转嫁 B.符合税收纳税能力
最新回复
(
0
)