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
考研
Mammals vary enormously in size, from weighing less than a penny to measuring more than three school buses in length. Some group
Mammals vary enormously in size, from weighing less than a penny to measuring more than three school buses in length. Some group
admin
2017-02-17
33
问题
Mammals vary enormously in size, from weighing less than a penny to measuring more than three school buses in length. Some groups of mammals have become very large, such as elephants and whales,【C1】______others have always been small, like primates. A new theory developed by an international team, led by Jordan Okie,【C2】______an explanation for why and how【C3】______groups of organisms are able to evolve【C4】______sizes, whereas others are not.
The research team【C5】______information on how quickly an individual animal grows and used it to【C6】______how large it may get【C7】______evolutionary time. Their research was published recently.
The new theory developed from the observation that some animals【C8】______fast and die young, while others take their time and mature much later. "Fast" animals-such as mice—breed very quickly, while humans mature slowly and are relatively older when they first have children. The theory【C9】______that those species that are relatively faster are more likely to evolve a large size quicker than slow species, and that their maximum size will be greater.
The research team tested their theory using the【C10】______records of mammals over the last 70 million years, examining the maximum size of each mammal group【C11】______that time, including whales, elephants, seals and primates. They found that their theory was very well【C12】______.
"Primates have evolved very slowly, and never got bigger than 1,000 pounds," said Okie, "The【C13】______was true of whales, which evolved their large size at the fastest【C14】______recorded."
The theory also makes predictions about the relative risks of extinction for large animals【C15】______small. The maximum size of an animal is limited by the rate of mortality in the【C16】______. Because larger animals【C17】______breed less frequently than smaller animals,【C18】______the mortality rate doubles, the maximum size is predicted to be 16 times smaller.
"This is a really surprising【C19】______," said Okie. "It points to another reason why many of the large animals went【C20】______after the last Ice Age, and their high risk of extinction in modern environments."
【C14】
选项
A、ways
B、ratios
C、rates
D、rhythms
答案
C
解析
本句涉及灵长类动物和鲸鱼的进化速率的比较,前者是进化缓慢且体重小,后者应是是进化极快体型大,因此所填入的词语必须能体现体重与成长时间之间的比例关系。C项rates“速率”能和空格前的at搭配。也能被fastest修饰。
转载请注明原文地址:https://jikaoti.com/ti/Yzv7FFFM
0
考研英语一
相关试题推荐
WhatdoRussia’sBelgorodprovinceandsomeschoolsinFloridaandConnecticuthaveincommon?Theyareunlikelyrecruitstothe
WhatdoRussia’sBelgorodprovinceandsomeschoolsinFloridaandConnecticuthaveincommon?Theyareunlikelyrecruitstothe
WhatdoRussia’sBelgorodprovinceandsomeschoolsinFloridaandConnecticuthaveincommon?Theyareunlikelyrecruitstothe
WhatdoRussia’sBelgorodprovinceandsomeschoolsinFloridaandConnecticuthaveincommon?Theyareunlikelyrecruitstothe
ForyearsAmericanconversationaboutIraqhasincludedarefrainabouthowwecannotexpecttocreateaJeffersoniandemocracy
IfAmericanmedicinewereapatient,hewouldweigh350poundsandbegainingfast.Despitebeingrepeatedlycounseledaboutthe
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
随机试题
下列有关授权和分权的说法,不正确的是()。
真菌性角膜炎的病因不包括
具有镇心安神,聪耳明目作用的药物是()
属于国家药品标准的是
新生儿娩出后1分钟内,心率92次/分,无呼吸,四肢稍屈,刺激咽喉部稍有反应,但无咳嗽,躯干红,四肢青紫。Apgar评分应得
根据个人所得税法律制度规定,将个人所得税的纳税义务人分为居民纳税人和非居民纳税人,依据的标准是()。
2013年第二季度,全国主要监测城市地价总体水平为3226元/平方米。三大重点区域:长江三角洲、珠江三角洲、环渤海地区综合地价水平分别为4770元/平方米、4552元/平方米、3465元/平方米。分用途看,珠江三角洲地区商服、住宅、工业地价环比
1984年,世界卫生组织在其宣言中指出,健康应包括生理、心理和______等几方面。
材料1:习近平总书记指出,扶贫开发工作已进入啃硬骨头、攻坚拔寨的冲刺期。他强调,各级党委和政府要扶贫先扶志、扶贫先扶智,尤其要在精准扶贫、精准脱贫上下更大功夫。扶贫工作中“输血”重要,“造血”更重要,扶贫先扶志,一定要把扶贫与扶志有机地结合
TheIndiansrisesoonasitislight,thechildrenrundowntotherivertoswim,thewomangotothecreektobringfreshwater
最新回复
(
0
)