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
75
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/2795107.html
相关试题推荐
[originaltext](22)Californiaisinthemidstoftheworstdroughtonrecor
[originaltext](22)Californiaisinthemidstoftheworstdroughtonrecor
[originaltext](22)Californiaisinthemidstoftheworstdroughtonrecor
[originaltext](22)Californiaisinthemidstoftheworstdroughtonrecor
[originaltext]Considerthefactthatcropsgenerallyproduceseveralhundre
[originaltext]Considerthefactthatcropsgenerallyproduceseveralhundre
[originaltext]M:Hello,Ihaveareservationfortonight.W:Yourname,please.
[originaltext]M:Hello,Ihaveareservationfortonight.W:Yourname,please.
[originaltext]W:AreyouallreadyforChristmas?M:Areyoukidding?(8)Ihaven
[originaltext]Anyideawhattheworld’sbestknownEnglishlanguageis?Bef
随机试题
Thatsheseemedtopreferdabblingtoconcentratedeffortisundeniable;neverth
WhatisCulture?Culture,inanthropology(人类学),the
HesaidthatI______(steal)hisbicycle,butIdeniedit.hadstolen句意:他说我偷了他的自行车
Students’pressuresometimescomesfromtheirparents.Mostparentsarewell
一旦超过法律规定的有效期限,知识产权权利就自行消失,是指知识产权的A.专有性B.
农村地区的许多孩子读书时不注意用眼卫生,在高中生涯结束时成为了近视眼,日常生产生
在商业银行的外汇交易中,直接标价法是以一定单位的本国货币为标准来计算应付出多少单
2019年6月,陈女士购买商铺一间,按不含税价款60万元依3%的税率缴纳契税1.
监理工程师对勘察设计单位的资质进行核查时,应重点核查其()。 A.营业执照
(2020年真题)根据《标准设备采购招标文件》中的通用合同条款,卖方交付合同约定
最新回复
(
0
)