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
2023-06-30
33
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/2795106.html
相关试题推荐
[originaltext]W:Doyouthinkitisaproblemthatpeoplearemovingoutfromt
[originaltext]W:Doyouthinkitisaproblemthatpeoplearemovingoutfromt
[originaltext]W:Doyouthinkitisaproblemthatpeoplearemovingoutfromt
[originaltext]W:Doyouthinkitisaproblemthatpeoplearemovingoutfromt
[originaltext]M:I’mundertheimpressionthatUnitedAirlinesflightsarealwa
[originaltext]M:I’mundertheimpressionthatUnitedAirlinesflightsarealwa
[originaltext]M:I’mundertheimpressionthatUnitedAirlinesflightsarealwa
[originaltext]M:I’mundertheimpressionthatUnitedAirlinesflightsarealwa
[originaltext]M:Ireallydon’tunderstandtheTVprograms.WhenIwatchamovi
[originaltext]M:Ireallydon’tunderstandtheTVprograms.WhenIwatchamovi
随机试题
Whenadoctordeterminesyourriskforheartdisease,heorshemightlooka
Forthispart,youareallowed30minutestowriteacompositiononthetopicCo
Alzheimer’sdisease(老年痴呆症)ismostlyaconditionofoldage.Sincelife【B1】__
广西少数民族婚姻习俗中,有招郎入赘习俗的有( )。A.壮族婚俗 B.瑶族婚俗
某妇女,27岁。身体健康,已育有一个10个月龄的孩子。最适合该妇女的避孕方法是(
房地产交易实质上是房地产()的交易。A.权利 B.利益 C.实物
资本一帝国主义列强对中国不但进行军事侵略、政治控制,还对中国进行经济掠夺。其对中
为十一届三中全会的召开奠定了思想基础的事件是( ) A.“两个凡是”思想的提
轨道线和趋势线是相互合作的一对,先有趋势线后有轨道线。()
中期借贷便利对资金的去向没有做明确规定。( )
最新回复
(
0
)