首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、They were carried by the wind. B、They had become more poisonous. C、They were less than on the continent. D、They poisoned some
A、They were carried by the wind. B、They had become more poisonous. C、They were less than on the continent. D、They poisoned some
admin
2017-01-20
76
问题
Birds are famous for carrying things around. Some, like homing pigeons, can be trained to deliver messages and packages. Other birds unknowingly carry seeds that cling to them for the ride.(9)Canadian scientists have found a worrisome, new example of the power that birds have to spread stuff around. Way up north in the Canadian Arctic, seabirds are picking up dangerous chemicals in the ocean and delivering them to ponds near where the birds live.
Some 10,000 pairs of the birds, called fulmars, a kind of Arctic seabird, make their nests on Devon Island, north of the Arctic Circle.(10)The fulmars travel some 400 kilometers over the sea to find food. When they return home, their droppings end up all around their nesting sites, including in nearby ponds.
(11)Previously, scientists noticed pollutants arriving in the Arctic with the wind. Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea. The bodies of fish and other meat-eaters can build up high levels of the chemicals.
To test the polluting power of fulmars, researchers collected samples of deposit from 11 ponds on Devon Island. In ponds closest to the colony, the results showed there were far more pollutants than in ponds less affected by the birds. The pollutants in the ponds appear to come from fish that fulmars eat when they’re out on the ocean.(12)People who live, hunt, or fish near bird colonies need to be careful, the researchers say. The birds don’t mean to cause harm, but the chemicals they carry can cause major problems.
Questions 9 to 12 are based on the passage you have just heard.
9. What have Canadian scientists found about some seabirds?
10. What does the speaker say about the seabirds called fulmars?
11. What did scientists previously notice about pollutants in the Arctic?
12. What does the speaker warn about at the end of the talk?
选项
A、They were carried by the wind.
B、They had become more poisonous.
C、They were less than on the continent.
D、They poisoned some of the fulmars.
答案
A
解析
短文中提到,以前科学家们就注意到,风可以将污染物带至北极,故答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/SgF7777K
0
大学英语六级
相关试题推荐
UptoamillionpeopleintheUKhave"completelypreventable"severeheadachescausedbytakingtoomanypainkillers,doctorss
Alltoooften,peopleapproachtheirworkcareershaphazardly,waitingforopportunitiestopresentthemselves,hopingtofalli
Alltoooften,peopleapproachtheirworkcareershaphazardly,waitingforopportunitiestopresentthemselves,hopingtofalli
Handwritinghasbecomeadyingart,nowthatkidsstartusingkeyboardsassoonastheybeginschool.Butwritingthingsoutby
A、Togiveuphispresentjob.B、Togetmoretraining.C、Toworkforawebhostingcompany.D、Toseizeopportunitiesofpromotion
Teenagerswillbetoldto"standupfortheirelders"onpublictransport—orrisklosingtheirrighttofreetravel.LondonMayo
A、HelearnedalotfromhisstudyinEngland.B、Helearnedmanyforeignlanguagesinhiscollege.C、Hewassatisfiedwithhised
A、Itwasmadenearlyentirelyofglass.B、Itishometoallkindsofathleticevents.C、Itwasmadealmostentirelyofcrystal.
Itseemstomethatneighborsaregoing【B1】______inAmerica.Thefriendnextdoorfromwhomyouborrowedfoureggsoraladderh
A、Listhergreateststrengthsandweaknesses.B、Saysomethingaboutherlikesanddislikes.C、Writeabriefreporttoherdepart
随机试题
男,68岁。排便习惯改变3个月,便中带血1周。查体:浅表淋巴结未触及肿大,腹平软,未触及包块,移动性浊音(-),肠鸣音正常。直肠指诊:直肠前壁距肛缘4cm菜花型肿物,侵及直肠1/4周径,肿物直径2cm,指套染血。为明确诊断及选择治疗方式,最佳的辅助检查是
A.由胃肠黏膜分泌过多液体引起腹泻B.由肠内容物渗透压增高引的腹泻C.由肠黏膜的吸收面积减少引起的腹泻D.由肠蠕动亢进,肠内食糜停留时间少所致的腹泻E.由某些致腹泻细菌内毒素刺激肠黏膜内cAMP致腹泻上述腹泻的发病机制,属于吸收不良性腹泻
某外国法院依照该国与我国缔结或共同参加的国际条约的规定提出司法协助请求,我国法院应该依照什么程序提供司法协助?()
影响施工质量的因素包括()的控制。
上市公司的组织机构健全、运行良好,应该符合下列( )规定。
在发行新股招股说明书中,关联交易可以按不同的交易类型分别披露。()
下列各项中,属于我国仲裁基本制度的有()。
甲从乙处购买一批货物,向乙支付1万元定金.现乙拒绝履行合同,甲有权要求乙返还定金()。
Itwasn’tlongbeforeFrankswasamarkedman.AfterheservedinDesertStorm,directinghelicopterandgroundunits,theArmy’
WhytheWarAgainstTerrorWillBoosttheEconomyThereisstillalotofuncertaintyabouthowtheU.S.economy.Toanalyze
最新回复
(
0
)