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
专升本
Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two ki
Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two ki
admin
2011-05-26
48
问题
Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership(伙伴关系) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in parasites(寄生虫) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.
Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals (珊瑚) of the sea. In their skins they have tiny plants which act as "dustman", taking some of the waste products from the coral and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from light so that they cannot live normally, the corals will die.
The underlined word "they" in the last sentence of the first paragraph refers to ______.
选项
A、birds and parasites
B、birds and sheep
C、parasites and sheep
D、sheep, birds and parasites
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/8C4GFFFM
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Mrs.Smithtreatedherlittledogquite______.Thebutcherdidnotgiveanymeattothedog______.
WhendidFather’sDayofficiallybegintohavenationalpopularity?WhatwasthefirstreactionoftheBritishpublictowardsF
WhendidFather’sDayofficiallybegintohavenationalpopularity?WhofirststartedtheideaofholdingtheFather’sDay?
We’veworkedouttheplanandnowwemustputitinto______.
Hardly______down______thephonerang.
It’sabouttimeyou______alittlelessmoney.
(Therearesigns)thatcomputerswillbebecomingmoreandmorepopularinordinaryfamilies.
______,wehaveachievedgreatsuccessinimprovingourpeople’slivingconditions.(doubt)
Theydidn’ttellme______gofortheirholiday.
IntheU.S.,peoplepreferwaitingforatabletosittingwithpeopletheydon’tknow.Thismeansahostessmaynotseatasmall
随机试题
在接待客户过程中,_______对你及客户都非常重要。
对脑脊液漏病人的护理,描述错误的是【】
A.回忆偏倚B.失访偏倚C.人院率偏倚D.易感性偏倚E.现患病例—新病例偏倚开展一次以医院为基础的病例对照研究,最常见的偏倚是
甲公司与乙公司签订并购协议:“甲公司以1亿元收购乙公司在丙公司中51%的股权。若股权过户后,甲公司未支付收购款,则乙公司有权解除并购协,议。’’后乙公司依约履行,甲公司却分文未付。乙公司向甲公司发送一份经过公证的《通知》:“鉴于你公司严重违约,建议双方终止
机床的负荷试验主要包括()。
下列关于基金相关定义的说法中,错误的是()。
先有工程设计图,然后施工建成大楼。这一事实说明()。
"Youtrytogetsomesleep.I’ll______thepatient’sbreakfast,"saidthenurse.
毛泽东提出“以苏联经验为鉴戒,走自己的路”重要思想的著作是
Thecostofstagingtheyear2000OlympicsinSydneyisestimatedtobeastaggering$960million,butthecityispreparingto
最新回复
(
0
)