首页
登录
职称英语
[originaltext] Cattle have served humanity since prehistoric days as beasts o
[originaltext] Cattle have served humanity since prehistoric days as beasts o
游客
2024-01-26
6
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、Cud.
B、Reticulum.
C、Bacteria.
D、Grass.
答案
C
解析
信息明示题。根据短文中Bacteria in cow’s stomachs aid in digesting the cellulose in stems of grass or hay.可知牛胃里的细菌帮助消化纤维素。故正确答案为C。
转载请注明原文地址:https://tihaiku.com/zcyy/3397303.html
相关试题推荐
[originaltext]Somepeoplethinkthatthebesttimetobeginstudyingaforei
[originaltext]Somepeoplethinkthatthebesttimetobeginstudyingaforei
[originaltext]Somepeoplethinkthatthebesttimetobeginstudyingaforei
[originaltext]TheaverageAmericanwillmove13timesinhislifetimeandm
[originaltext]TheaverageAmericanwillmove13timesinhislifetimeandm
[originaltext]W:So,you’llbegettingdresseduplater—beforeyougototheBB
[originaltext]W:So,you’llbegettingdresseduplater—beforeyougototheBB
[originaltext]W:Excuseme.MywatchstoppedrunningandI’mnotsurewhat’s
[originaltext]W:Excuseme.MywatchstoppedrunningandI’mnotsurewhat’s
[originaltext]Morethan22millionpeoplewholiveintheUniteStatedon’t
随机试题
[originaltext]W:You’vespenttoomuchtimedoingyourcoursework,Sam.Don’ty
HowtoStudyEnglishinYourDream:theTheoryI.Introduction
Withalittlecarehe______thataccident.A、wouldavoidB、couldhaveavoidedC、
[audioFiles]audio_eusm_j01_099(20099)[/audioFiles]A、Themanshouldstartrunnin
Fightunhealthyfood,notfatpeopleIt’shardlybreakin
进入新时代,全面深化改革的新实践和新的时代条件,为进一步丰富和发展党的理论___
根据资料,下列表述不正确的是:() A.2010年末T市各类福利院有床位不
论述分组教学制。
标准仓单的形式有()。A.仓库标准仓单 B.厂库标准仓单 C.通用标准仓单
在叶片泵的性能参数中,用来确定泵安装高程的是( )。A.扬程 B.允许吸上真
最新回复
(
0
)