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
2024-01-29
71
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、Food storage.
B、The production of milk.
C、Digestion.
D、The creation of cuds.
答案
D
解析
信息明示题。短文中指出Later the food passes into the second stomach or reticulum where it is rolled into little balls or cuds.故可知第二个胃用来形成反刍的食物。故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3403066.html
相关试题推荐
[originaltext]MyfatherwokemeupearlyonemorningwhenIwasfourteen,a
[originaltext]MyfatherwokemeupearlyonemorningwhenIwasfourteen,a
[originaltext]MyfatherwokemeupearlyonemorningwhenIwasfourteen,a
[originaltext]Didyouknowthatthere’sakindofbirdthatcansew?Thisb
[originaltext]Didyouknowthatthere’sakindofbirdthatcansew?Thisb
[originaltext]OnehundredandthirteenmillionAmericanshaveatleastone
[originaltext]OnehundredandthirteenmillionAmericanshaveatleastone
[originaltext]WhenthetopU.S.oilcompaniesannouncedhugeincreasesinp
[originaltext]Inastatement,theUSpresidentsaysheistakingtheaction
[originaltext]Forseveralyears,humanresourcesdirectorPeteTapaskarsay
随机试题
HowtoDuckCabinFeversAndOtherAchesonaPlane?[A]Onthefirs
商品市场供给量由()组成。A、期末结存量B、期初存量C、本期产量D、本期进口量B,C,D本期供给量由期初存量、本期产量和本期进口量构成。
问题的三个基本成分,给定条件、要达到目标和( )。
配电箱与开关箱内的漏电保护器极数和线数必须与其负荷侧负荷的相数和线数()。A.
A.原发性牙本质 B.生长线 C.继发性牙本质 D.前期牙本质 E.管周
患者发热,心浊音界呈烧瓶状,并随体位而变化,可能的病因是A.心肌炎 B.心肌病
共用题干 患者男性,69岁,农民,文化水平较低,胃癌术后。护士在探视时间与其进
七厘散的药物组成中不含有A.乳香 B.没药 C.红花 D.降香
棕榈油在国内完全是依赖进口的植物油品种。2010年10月10日,国内某棕榈油贸易
下列评标委员会成员的行为,合法的是( )。A.向招标人征询确定中标人的意向
最新回复
(
0
)