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
2010-07-11
75
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 which is good for 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 the parasites(寄生虫)on the 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 partnership develops until the two partners cannot manage without each other. This is so in corals(珊瑚)of the sea. In their skins they have tiny plants which act as "dustmen" , taking some of the waste products from the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they can not live normally, the corals will die.
Some birds like to sit on a sheep because______.
选项
A、they can eat its parasites
B、they enjoy traveling with the sheep
C、they depend on the sheep for existence
D、they find the position most comfortable
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/X8LC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
TodaythecomputerplaysavitalroleinthelivesofmanyAmericansandisseenasoneofthegreatesttechnologicaldevelopmen
Haveyou【B1】______askedyourselfwhychildrengotoschool?Youwillprobablysaythattheygo【B2】______theirownlanguagea
IthadneveroccurredtohimtostartafamilyuntilhemetSusan.
—Theremustbesomeoneatthedoor.—Whocould______be?Itisalreadymidnight.
Theactualcostofthebuildingwasmuchhigherthanouroriginal______.
AWithmyreturn,IBlearnedthatProfessorSmithChadbeenatthemuseumandwouldnotbebackDforseveralhours.
Thepassengers______outoftheexitwhenwearrivedattheairport.
WhileTimwaswalkinginthestreet,hecame______anoldclassmateofhis.
Mybosswon’tpayme______Iworkharder.
Aftertheflood,thevillagersaretryingtheirbesttogetthingbackto______.
随机试题
工业企业在计划期内生产的符合质量的工业产品实物量叫产品产量。()
知识的转换和增值涉及的要素不包括()
患者,男性,农民,29岁。因发热、头痛、腰痛、口鼻出血4天入院。半个月前参加秋收(当地鼠害比较严重),5天前突发高热、寒战、头痛、全身酸痛,尤以肾区疼痛为甚。血压97/60mmHg,体温38.8℃。面色潮红,呈醉酒貌。睑结膜及咽部、颊黏膜充血,水肿并点状出
个人理财业务活动中法律关系的主体有两个,即()。
下列说法中,不属于中国银监会监管目标的是()。
银行业监督管理机构从事监督管理工作的人员有()情形之一的,依法给予行政:分;构成犯罪的,依法追究刑事责任。
第二批入选中国优秀旅游城市的是()。
除特殊性的企业外,国有大中型企业尤其是重要的优势企业,最宜于实行()。
ItiscommonforAmericanstohavedifferent"circlesoffriends"suchaschurchfriends,workfriends,orsportsfriends.【R1】__
A、Watersoffalevelcoast.B、Theforestareasnearthesea.C、Theareasnearthemouthsofrivers.D、BothAandC.D事实细节题原文当中已
最新回复
(
0
)