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
All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about
All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about
admin
2012-08-25
21
问题
All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonelective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common.
But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg-guarding fish do not, for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food eaten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement, provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.
For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal’s life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope. Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do no survive.
The word "provisioning" in line 13 is closest in meaning to
选项
A、supplying
B、preparing
C、building
D、expanding
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/mryO777K
0
托福(TOEFL)
相关试题推荐
Answerthequestionsbelow.ChooseNOMORETHANTHREEWORDSAND/ORANUMBERfromthepassageforeachanswer.Writeyouranswers
Completethesummarybelow.ChooseNOMORETHANTHREEWORDSfromthepassageforeachanswer.Writeyouranswersinboxe
Completethesummarybelow.ChooseNOMORETHANTHREEWORDSfromthepassageforeachanswer.Writeyouranswersinboxe
Answerthequestionsbelow.ChooseNOMORETHANTHREEWORDSAND/ORANUMBERfromthepassageforeachanswer.Writeyouranswers
Answerthequestionsbelow.ChooseNOMORETHANTHREEWORDSfromthepassageforeachanswer.Writeyouranswersinboxesonyou
TheInnovationofGroceryStoresA.Attheverybeginningofthe20thcentury,theAmericangrocerystoresofferedcomprehen
TheInnovationofGroceryStoresA.Attheverybeginningofthe20thcentury,theAmericangrocerystoresofferedcomprehen
CompanyInnovationA.InashabbyofficeindowntownManhattan,agroupof30AI(artificialintelligence)programmersfrom
WhichmetalweretheCeltsusingatthebeginningofthefirstmillenniumB.C.?
Completethenotesbelow.WriteNOMORETHANONEWORDforeachanswer.AdviceonplumbersanddecoratorsExampleMakesurethec
随机试题
在某项目规划中,主要综合了关键线路法和计划评审法.这表明该项目规划采用的管理方法是【】
A.髁突硬化B.髁突前斜面模糊不清C.髁突骨质增生D.髁突小凹陷缺损E.髁突囊样变表现为髁突边缘呈唇样或骨赘形成
A.链霉素或四环素+磺胺B.青霉素+链霉素C.四环素+青霉素D.链霉素+异烟肼E.多黏菌素B+某些抗生素急性细菌性心内膜炎的治疗用
患者,女,38岁。因左腮腺肿物行“左腮腺浅叶及肿物切除术加面神经解剖术”。术后3天发现左眼不能闭合,皱眉力弱,额纹存在,眼睑以下无明显面瘫表现。该患者术中可能损伤了
某外科医师善治疮肿瘰疬、乳腺增生等,常用中成药小金丸(糊丸),用后每能收效。该药处方有人工香、木鳖子(去壳去油)、制草乌、枫香脂、醋乳香、醋没药、五灵脂(醋炒)、酒当归、地龙、香墨等,功能散结消肿、化瘀止痛,主治痰气凝结所致的瘰疬、瘿瘤、乳岩、
甲公司与乙信用社签订了一份借款合同。合同约定:甲公司向乙信用社贷款人民币500万元,借款期限为3年,借款用途为技术改造。甲公司按照信用社的要求提供保证担保,保证人为当地县政府。乙信用社为了控制风险,将利息75万元预先在本金中扣除。要求:根据以上事
恩物
根据《消费者权益保护法》的规定,下列有关经营者义务说法错误的是()。
社会习俗影响人性格的形成这个主张已经被普遍接受了。这种说法只把个人当成社会影响的顺从的接受者,个性完全是社会的产物,在生活中任何一个方面,个人的性格都会被社会的管理所改变。而犯罪之所以存在据说是因为社会在某些方面没有能够尽到使每个人都过上富足的生活这一责任
甲公司欲购买空调,遂委托乙公司办理相关事宜。甲公司向乙公司出具了证明文件:本公司兹委托乙公司前往贵单位购买空调10台,请予以接洽。乙公司是电器生产企业丙公司的代理商,为方便起见,乙公司业务人员就从丙公司那里为甲公司订购了10台柜式空调,另外又帮甲公司从丁公
最新回复
(
0
)