首页
登录
职称英语
[originaltext] Pigs are not native to North America. They were first introdu
[originaltext] Pigs are not native to North America. They were first introdu
游客
2024-01-21
6
管理
问题
Pigs are not native to North America. They were first introduced to California by Spanish and Russian explorers and settlers many centuries ago. In the early times, pigs were allowed to wander freely in search of food. This practice also allowed many pigs to escape from farms and live in the wild, which became a problem.
In fact, as one of the most damaging invasive species on the continent, wild pigs cause millions of dollars in crop damage yearly. They also harbor dozens of diseases that threaten both humans and farm animals. Forest patches with wild pigs have been found to have considerably reduced plant and animal diversity. In addition to either eating other animals or their food supply, wild pigs damage native habitats by rooting up grasses and rubbing on trees. Their activities may also create opportunities for invasive plants to colonize these areas. Wild pigs will eat almost anything containing calories. Mice, deer, birds, snakes and frogs are among their victims. They can also harm other wild species through indirect competition, rather than eating them or shrinking their food supply. On one particular United States island, wild pigs themselves became an attractive food source for a species of mainland eagle. The eagles began breeding on the island, and also feeding on a species of native fox. The foxes were almost wiped out completely.
Questions 16 to 18 are based on the passage you have just heard.
16. What do we learn about early pigs in North America?
17. Why are wild pigs a threat to humans?
18. What does the passage say about the native foxes on the US island?
选项
A、They often make sudden attacks on people.
B、They break up nature’s food supply chain.
C、They cause much environmental pollution.
D、They carry a great many diseases.
答案
D
解析
短文提到,野猪每年造成数百万美元的作物损失,它们还携带着许多威胁人类和家畜的疾病,因此答案为D)。
转载请注明原文地址:https://tihaiku.com/zcyy/3382689.html
相关试题推荐
[originaltext](22)Sportshaveunwrittenrules,sodoesbusiness—andviolato
[originaltext](22)Sportshaveunwrittenrules,sodoesbusiness—andviolato
[originaltext](22)Sportshaveunwrittenrules,sodoesbusiness—andviolato
[originaltext]IhadspentmylastdayinLondonvisitingfriends,takingpic
[originaltext]Passionfruitistheediblefruitofthepassionflower.(16)Sp
[originaltext]Passionfruitistheediblefruitofthepassionflower.(16)Sp
[originaltext]M:EnglishLanguageCenter.HowmayIhelpyou?W:Yes.I’mcalli
[originaltext]M:EnglishLanguageCenter.HowmayIhelpyou?W:Yes.I’mcalli
[originaltext]W:Heytaxi!M:Whereto?W:Well,I’mgoingtotheNationalMuse
[originaltext]W:Heytaxi!M:Whereto?W:Well,I’mgoingtotheNationalMuse
随机试题
Protestorsdemonstratedinthecapitaltoshowtheirdissatisfactionwith_______
[originaltext]W:Hi,Michael.Icanhardlyrecognizeyou.Whyareyoudressedu
下列有关我国现行税制结构的说法中,不正确的是()。A.以流转税和所得税并重为主体
拱部衬砌浇筑时,每模台车范围内的预留孔应不少于()。A、1个 B、2个 C
A.挥发油B.甘油酯类C.生物碱D.有机酸E.鞣质药材砂仁的主要成分是
抗人球蛋白试验直接法下列哪项是正确的()A.检查红细胞表面不完全抗体B.加抗人
一次,拿破仑对他的秘书说:“布里昂,你也将永垂不朽了。”布里昂迷惑不解,拿破有仑
根据现行法规,从2014年起,中央补助公共租赁住房建设资金以及租赁补贴资金继续由
个人经营类贷款一般面向从事合法生产经营的自然人,包括()。A.法人企业 B
A.立即进行抢救治疗 B.立即使用抗高血压药物 C.观察相当一段时间,再决定
最新回复
(
0
)