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
57
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.
Some birds like to sit on a sheep because ______.
选项
A、they can eat its parasites
B、they depend on the sheep for existence
C、they enjoy travelling with the sheep
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/1SqC777K
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
Hehadtriedeverythingbutitmadelittle______.
Hewantstobecome______adoctororateacher.
Theexhibitionwasnotverycrowded.Therewere______peoplethanIexpected.
The______(much)youlistentoEnglish,theeasieritbecomes.
We’veworkedouttheplanandnowwemustputitinto______.
RonaldMusokeisastudentat______inCalifornia.Thepropertitleforthispassageis______.
DameEdnaisfamous______.DameEdna______.
Heiswidely______asoneofourbestyoungscientists.
Accordingtotheauthor,feelingdepressedis______.Thephenomenonthattoday’schildrenseemadult-likeisattributedbythe
Accordingtothefirstparagraph,theatmosphereisessentialtomaninthat______.Weknowfromthepassagethat______.
随机试题
构成结核病重要传染源的肺结核类型是
不属于贫血形态学分类范围的是
何谓髁导斜度
某省有甲、乙两市,乙市电视台首播的电视连续剧《天山刀客》收视率很高,甲市为了提高自己的收视率,将乙市电视台播放的该电视连续剧收录下来,然后在本市电视台播放。乙市丙西餐厅将主题曲录制下来,在营业时间播放。下列说法正确的有:
用水泥土搅拌成桩的施工流程是:定位→预埋下沉→提升并喷浆搅拌→重复下沉搅拌→重复提升搅拌→成桩结束。这一工艺过程应称为( )。
政府债券的发行主体是政府所属的机构,它是一种标准化的国债。()
下列不属于CAMELs评级六大要素的是()。
下列函数在x=0处可导的是()。
小明的爸爸是A型血,小明的妈妈是B型血,则小明会出现的血型有()。
生命没有寄托的人,青年时代和“儿时”对他格外宝贵。这种浪漫的回忆其实并不是发现了“儿时”的真正了不得,而是感觉到“中年”以后的衰退。本来,生命只有一次,对于谁都是宝贵的。但是,假使他的生命溶化在大众的里面,假使他天天在为这个世界干些什么,那么,他总在生长,
最新回复
(
0
)