首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In the past oysters were raised in much the same way as dirt farmers raised tomatoes—by transplanting them. First, farmers selec
In the past oysters were raised in much the same way as dirt farmers raised tomatoes—by transplanting them. First, farmers selec
admin
2012-05-17
64
问题
In the past oysters were raised in much the same way as dirt farmers raised tomatoes—by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, and then scattered clean shells about. Next they "planted" fertilized oyster eggs, which within two or three weeks hatched into larvae. The larvae drifted until they attached themselves to the clean shells on the bottom. There they remained and in time grew into baby oysters called seed or spat. The spat grew larger by drawing in seawater from which they derived microscopic particles of food. Before long, farmers gathered the baby oysters, transplanted them in other waters to speed up their growth, and then transplanted them once more into another body of water to fatten them up.
Until recently the supply of wild oysters and those crudely farmed were more than enough to satisfy people’s needs. But today the delectable seafood is no longer available in abundance. The problem has become so serious that some oyster beds have vanished entirely.
Fortunately, as far back as the early 1900’s marine biologists realized that if new measures were not taken, oysters would become extinct or at least luxury food. So they set up well equipped hatcheries and went to work. But they did not have the proper equipment or the skill to handle the eggs. They did not know when, what, and how to feed the larvae. And they knew little about the predators that attacked and ate baby oysters by the millions. They failed, but they doggedly kept at it. Finally, in the 1940’s a significant breakthrough was made.
The marine biologists discovered that by raising the temperature of the water, they could induce oysters to spawn not only in the summer but also in the fall, winter, and spring. Later they developed a technique for feeding the larvae and rearing them to spat. Going still further, they succeeded in breeding new strains that were resistant to diseases, grew faster and larger, and flourished in water of different salinities and temperatures. In addition, the cultivated oysters tasted better!
In the passage, the author mentions that the new strains of oyster are______.
选项
A、cheaper
B、shaped differently
C、better textured
D、healthier
答案
D
解析
推理判断题。从文章最后一段第三句Going still further,they succeeded in breeding new strains that were resistant to diseases(并且还培育了新品种,这种新品种可以抵抗病害)可以得出线索,resistant to diseases与选项D属同一语义范畴,选项A的意思是“更便宜”.选项B的意思是“外形不同”,选项C的意思是“更漂亮的纹理”文中均未涉及。因此选择D。
转载请注明原文地址:https://kaotiyun.com/show/0xf7777K
0
大学英语四级
相关试题推荐
A、TeacherandstudentB、SistersC、GoodfriendsD、MotheranddaughterC问题是“MariaMinkarah和MeganDellaSelva的关系是什么?”正确答案是“好朋友”,其依据是“
Thewayoursocietyisstructuredaffectsallhumanrelationships.OutsidethehomeWehaveasystemofpowerrelationship:work
A、Shemaynotbeabletohelptheman.B、ShewilltalktoJudyabouttheproblem.C、Sheisn’tsureifJudycansolvetheproblem
Allofusoughttobeabletobraceourselvesforthepredictablechallengesandsetbacksthatcropupinoureverydaylife.If
A、InOakCreekApartments.B、Withhisparents.C、Inastudentdormitory.D、Withhisgirlfriend.C
Scientistssaytheyhave【B1】______evidencethatjoggingisgoodforpeople.ThislatestEuropeanresearch【B2】______headline-maki
Hedidnotworkhardenoughathislessons.____________(否则他就会通过考试了)
Theautomobilehasmanyadvantages.Aboveall,it【B1】______peoplefreedomtogowheretheywanttogowhentheywanttogothere
"Tear’emapart!....Killthefool!....Murderthereferee(裁判)!"Thesearecommonremarksonemayhearatvariouss
A、AmericanfarmerstraveltochurchonSaturdays.B、ThelifeofAmericanfarmershaschangedwithmodernthings.C、Theschoolsa
随机试题
邓小平关于社会主义本质的论断中,处于基础地位的是
下焦病证多为肝肾阴伤,故可出现
哪项是心力衰竭的基本病因()(2006年)
抑制HIV病毒的药物是()。
设函数f(x)在(a,b)内可微,且f’(x)≠0,则f(x)在(a,b)内()。
应付票据是应付账款的书面证明。与银行借款相比,下面关于应付票据的利率、筹资成本和风险表述正确的是()。
下列属于土地增值税的纳税义务人的有()。
牛顿废寝忘食的故事伟大的科学家牛顿对自己的工作极端专心,常常废寝忘食。有一天,一个朋友等他吃饭,可是他在工作室专心工作,很久很久都不出来,那个朋友等饿了,就一个人先吃了。吃完后,他和牛顿开个玩笑,把自己吃剩下的肉骨头、鸡骨头都放到牛顿的饭盒里,然后走了。
______resultsin"Acidrain"?______maygiveoffmoreradioactivepollutionintotheairthananuclearplant?
EveryoneintheofficeknowsthatMelindatakesinfinitecareoverherwork.Theunderlinedpartmeans______.
最新回复
(
0
)