首页
登录
职称英语
[originaltext] Cattle have served humanity since prehistoric days as beasts
[originaltext] Cattle have served humanity since prehistoric days as beasts
游客
2024-02-07
38
管理
问题
Cattle have served humanity since prehistoric days as beasts of burden and as suppliers of leather, meat, and milk. Some of the earliest written records concern the sale of cattle. These valuable animals are unusual in that they do not have front teeth in their upper jaw. Instead they chew with their rear teeth and gums. Cows swallow their food quickly and store it in the paunch or rumen, the first of the four compartments in their stomachs. Later the food passes into the second stomach or reticulum where it is rolled into little balls or cuds. While resting, cows cough up these cuds and chew them more thoroughly. This time the food passes into the third and then into the fourth stomach, where digestion takes place. Bacteria in cow’s stomachs aid in digesting the cellulose in stems of grass or hay.
Over one hundred million head of cattle are raised in the United States. Dairy cattle produce more than fifteen and one-half billion gallons of milk every year. Although dairy cattle are bred primarily to produce milk, about half the beef used in the United States comes from dairy breeds. This is because when dry(no longer producing milk)they fatten quickly and produce high-quality beef.
Questions 16 to 18 are based on the passage you have just heard.
16. According to the passage, what is the rumen?
17. What is the cow’ s second stomach used primarily for?
18. Which of the following is essential in the digestion of cellulose in the cow’ s stomach?
选项
A、The first stomach compartment.
B、The name of the upper jaw.
C、The stomach where digestion takes place.
D、The name of the bacteria in the cow’ s stomach.
答案
A
解析
信息明示题。短文中指出the paunch or rumen,the first of the four compartments in their stomachs。故可知rumen是牛四个胃中的第一胃。所以选A。
转载请注明原文地址:http://tihaiku.com/zcyy/3429340.html
相关试题推荐
[originaltext]ClimatechangehasalteredthelivesofNativeAlaskansinth
[originaltext]CrimeisaseriousprobleminBritain.Onesortofcrimewhic
[originaltext]CrimeisaseriousprobleminBritain.Onesortofcrimewhic
[originaltext]CharlieParkerisoneofAmerica’sgreatestjazzmusicians.H
[originaltext]M:Iwonderifthisisgoingtobeaninterestingclass.W:Yeah,
[originaltext]M:Iwonderifthisisgoingtobeaninterestingclass.W:Yeah,
[originaltext]M:Hey,Cathy.Youdidn’tsayevenawordinthelasttenminutes
[originaltext]M:Hey,Cathy.Youdidn’tsayevenawordinthelasttenminutes
[originaltext]M:WhatdoyoudoinclasswhenstudentsdonotspeakEnglishbut
[originaltext]M:WhatdoyoudoinclasswhenstudentsdonotspeakEnglishbut
随机试题
Momwasbusycookinginthekitchen________DadwaswatchingTVcomfortably.A、whi
肾上腺皮质功能低下时可出现()A.血容量减少 B.血容量增多 C. D
结合实际,谈谈如何在高校教学过程中贯彻传授知识与培养能力相统一的原则。
请回答防眩板抗风荷载试验的相关问题。(3)防眩板的抗风荷载F的取值应为()。A.
H受体拮抗剂的作用强而持久且副作用少的是A.雷尼替丁 B.两咪替丁 C.法
制吴茱萸炮制时加入的辅料是A.胆汁 B.黑豆汁 C.甘草汁 D.豆腐
甲市政府应上级指示进行新农村规划建设,拟设立一大型休闲活动中心。该休闲活动中心拟
由于铁矿石的价格对钢铁企业的成本影响巨大。为保证钢铁企业的生产经营稳步进行,应该
建筑工地临时供电的架空配电线路,要求线间距离不得小于()m。A.0.2
某公司发行普通股股票融资,社会无风险投资收益率为8%,市场投资组合预期收益率为1
最新回复
(
0
)