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
2023-07-06
52
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:https://tihaiku.com/zcyy/2813074.html
相关试题推荐
[originaltext]Whatwillpeopledieof100yearsfromnow?Ifyouthinkthat
[originaltext]Whatwillpeopledieof100yearsfromnow?Ifyouthinkthat
[originaltext]Thedoghasoftenbeenanunselfishfriendtoman.Itisalwa
[originaltext]Thedoghasoftenbeenanunselfishfriendtoman.Itisalwa
[originaltext]M:EnglishLanguageCentre.MayIhelpyou?W:Yes.I’mcallingt
[originaltext]M:EnglishLanguageCentre.MayIhelpyou?W:Yes.I’mcallingt
[originaltext]M:Soyouworkinapub.W:Yes,that’sright.M:What’sitlike?
[originaltext]M:Soyouworkinapub.W:Yes,that’sright.M:What’sitlike?
[originaltext]M:Soyouworkinapub.W:Yes,that’sright.M:What’sitlike?
[originaltext]M:Hi,Donna,areyouinterestedingoingtoanartexhibitionon
随机试题
Sheintendstomovethatthecommittee______discussiononthisissue.A、suspend
Fiveoutoftenoftheworld’slargestfoodcompaniesareaggressivelyexplo
[originaltext]Thereareseveraldifferentwaysinwhichapersonmaybecome
下列生态系统中,物种丰富度最高的是()A.热带草原 B.热带雨林 C.寒温
A. B. C. D.
符某,女,48岁。痢下日久不愈,下痢稀薄,带有白冻,甚则滑脱不禁,腹部隐痛,口淡
房地产市场划为现房市场和期房市场,其分类依据为( )。A.房地产档次 B.买
患者,男,65岁。患慢性支气管炎12年,经常自觉胸闷、气短,诊断为慢性心功能不全
在护理骨牵引患者时,如牵引过度可引起A、骨愈合障碍 B、肢体畸形 C、剧烈疼
在房地产开发企业土地清算时,属于扣除项目的有()。A.销售开发产品缴纳的印花税
最新回复
(
0
)