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
医学
In the early 1960s Wilt Chamberlain was one of only three players in the National Basketball Association (NBA) listed at over se
In the early 1960s Wilt Chamberlain was one of only three players in the National Basketball Association (NBA) listed at over se
admin
2021-11-29
66
问题
In the early 1960s Wilt Chamberlain was one of only three players in the National Basketball Association (NBA) listed at over seven feet. If he had played last season, however, he would have been one of 42. The bodies playing major professional sports have changed dramatically over the years, and managers have been more than willing to adjust team uniforms to fit the growing numbers of bigger, longer frames.
The trend in sports, though, may be obscuring an unrecognized reality: Americans have generally stopped growing. Though typically about two inches taller now than 140 years ago, today’s people especially those born to families who have lived in the U.S. for many generations — apparently reached their limit in the early 1960s. And they aren’t likely to get any taller. "In the general population today, at this genetic, environmental level, we’ve pretty much gone as far as we can go," says anthropologist William Cameron Chumlea of Wright State University. In the case of NBA players, their increase in height appears to result from the increasingly common practice of recruiting players from all over the world.
Growth, which rarely continues beyond the age of 20, demands calories and nutrients — notably, protein — to feed expanding tissues. At the start of the 20th century, under-nutrition and childhood infections got in the way. But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height. Yet according to the Centers for Disease Control and Prevention, average height—5’9" for men, 5’4" for women—hasn’t really changed since 1960.
Genetically speaking, there are advantages to avoiding substantial height. During childbirth, larger babies have more difficulty passing through the birth canal. Moreover, even though humans have been upright for millions of years, our feet and back continue to struggle with bipedal posture and cannot easily withstand repeated strain imposed by oversize limbs. "There are some real constraints that are set by the genetic architecture of the individual organism," says anthropologist William Leonard of Northwestern University.
Genetic maximums can change, but don’t expect this to happen soon. Claire C. Gordon, senior anthropologist at the Army Research Center in Natick, Mass., ensures that 90 percent of the uniforms and workstations fit recruits without alteration. She says that, unlike those for basketball, the length of military uniforms has not changed for some time. And if you need to predict human height in the near future to design a piece of equipment, Gordon says that by and large, "you could use today’s data and feel fairly confident."
The text intends to tell us that________.
选项
A、the change of human height follows a cyclic pattern
B、human height is becoming even more predictable
C、Americans have reached their genetic growth limit
D、the genetic pattern of Americans has altered
答案
C
解析
选项A的意思是:人类的身高改变遵循着周期的模式。文章中没提到这点。选项B的意思是:人类的身高变得更加具有可预知性。文中表达美国人增长的尺度达到了极限,没有提到整个人类的身高的尺度问题。选项D的意思是:美国人的基因形态已改变,文中未提到这项内容。选项C的意思是:美国人的身高己经达到了基因增长的极限。文中主要说明由于基因的限制,美国人已经达到了身高的极限。所以下面要谈的问题还是与此相关的具体论证。故答案为C。
转载请注明原文地址:https://kaotiyun.com/show/UoH3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
A、His50thbirthday.B、NASA’s50thanniversary.C、TheUniversity’s50thanniversary.D、TheUSCosmologyAssociation’s50thAn
Withthe______ofChina’spoliticalinfluenceontheinternationalstage,overseasChinesearemoreandmorerespectedinallfi
TheNationalTrusthasworkedforthepreservationofplacesofhistoricinterestandnaturalbeautyinEngland,WalesandNorth
TheNationalTrusthasworkedforthepreservationofplacesofhistoricinterestandnaturalbeautyinEngland,WalesandNorth
TheNationalTrusthasworkedforthepreservationofplacesofhistoricinterestandnaturalbeautyinEngland,WalesandNorth
Everyyear,theAmericanLungAssociation(ALA)releasesitsannualreportcardonsmog,andeveryyearitgives"F"tooverhalf
随机试题
恶心呕吐、呃逆嗳气等症频作,其病机是
外感咳嗽属于
在血清蛋白质中主要来自浆细胞的是
有一批货物,已投保平安险,分两只船装运,一起运往目的港。由于航运过程中遇暴风雨的袭击,甲轮因船身颠簸,致使船上货物相互碰撞发生部分损失,而乙轮则不慎与另一货轮发生碰撞,为了船货的安全,船长被迫抛弃大部分船上货物,从而发生部分损失。保险公司应如何予以赔偿?(
某市有多家家电企业,其中甲公司、乙公司和丙公司的产品在该地的市场占有率达80%,三家公司的控股股东均为丁公司,为占有更大市场份额,三家公司决定合并,下列说法正确的是:
审计人员在根据样本结果推断总体以形成审计结论时,具体的程序和内容包括()。
甲受某国企委托,负责查验出场单、验货放行。甲与无业人员乙串通,趁甲一人值班时,由乙开车从货场拉出价值10万元的货物,并销赃平分。在本案中()。
某公司年会设有6个红包,分别装有100、200、300、400、500、600元现金,若从中任意抽取3个红包且红包内总金额能被三等分,则三个红包归抽中的人所有。那么中奖概率为多少?
刘老师带了41名同学去北海公园划船,共租了10条船。每条大船坐6人,每条小船坐4人,问大船、小船各租几条( )。
WhatistheauthortryingtoprovewiththequotationofWinstonChurchill?Whatdoestheword"unparalleled"(Para.2Line4)
最新回复
(
0
)