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
2023-06-27
26
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个。所以选A。
转载请注明原文地址:https://tihaiku.com/zcyy/2786799.html
相关试题推荐
[originaltext]Mr.MiyazakiisthefirstevermalelawmakerinJapantorequ
[originaltext]Areelectriccarsthewayofthefuture?Automobilemanufactu
[originaltext]Areelectriccarsthewayofthefuture?Automobilemanufactu
[originaltext]EverycultureandeverycountryintheworldcelebratestheN
[originaltext]EverycultureandeverycountryintheworldcelebratestheN
[originaltext]EverycultureandeverycountryintheworldcelebratestheN
[originaltext]W:Hey!Yougotanewtelevision.M:Yeah!Itwasdeliveredyeste
[originaltext]W:Hey!Yougotanewtelevision.M:Yeah!Itwasdeliveredyeste
[originaltext]W:Hey!Yougotanewtelevision.M:Yeah!Itwasdeliveredyeste
[originaltext]M:Goodmorning.You’reMs.Clay,right?Dositdown,please.Now
随机试题
Allthroughtheagesthebathasbeenacreatureofgreatmystery.Batshave
[originaltext]Whetherit’sinthehandsofanimatedpolarbearsorSantaCl
JapaneseelectronicsfirmHitachihasproduceditsfirsthuman-likerobot,c
[originaltext]TheAmericansbelievethatanybodycanbecomePresidentoft
能使冠状动脉血流量增多的因素是A、主动脉舒张压降低 B、体循环外周阻力减少
A. B. C. D.
.真核生物转录生成的mRNA属于A.内含子 B.外显子 C.多顺反子 D.
下列选项中,属于洗钱罪对象的有()。A.毒品犯罪所得及其产生的收益 B.金融诈
共用题干 2009年10月,某建筑公司在中国境内发生如下业务:1)承建甲企业办
某工程包含两个子项工程,合同约定甲项200元/㎡,乙项180元/㎡,且从第一个月
最新回复
(
0
)