首页
登录
职称英语
In the early 1960s Wilt Chamberlain was one of only three players in the Nat
In the early 1960s Wilt Chamberlain was one of only three players in the Nat
游客
2025-05-02
1
管理
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, envi-ronmental level, we’ve pretty much gone as far as we can go, " says anthropologist William Cameron Chum-lea 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 " [br] Which of the following plays a key role in body growth according to the text?
选项
A、Genetic modification.
B、Natural environment
C、Living standards.
D、Daily exercise.
答案
C
解析
文章第二段中提到,“In the general population today,at this genetic,environmental level,we’ve pretty much gone as far as we can go”,以及第三段中提到的,“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.”说明生活水平在成长中占据了主要角色,A选项中“modification”以及B、D选项在文中都没有提到。
转载请注明原文地址:https://www.tihaiku.com/zcyy/4058217.html
相关试题推荐
Twosubstituteswereusedduringthebasketballgames.A、playersB、centersC、refe
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersintheNat
Twosubstituteswereusedduringthebasketballgames.A、playersB、centersC、refe
whichsporthasthemostexpenses______trainingequipment,players’personalequ
Playerswillbe______againstfourothersworldwideinatimedcompetitiontoa
Playerswillbe_____againstfourothersworldwideinatimedcompetitiontoansw
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersintheNat
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersintheNat
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersintheNat
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersintheNat
随机试题
A—bumperB—reversinglightC—passengerseatD—doorhandleE—
Oneofthemajorproducersofathleticfootwear,with2002salesofover$10
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeople
《一千零一夜》是阿拉伯的民间故事集.又叫作什么A.《天方夜谭》 B《圣经》
根据继电保护和安全自动装置缺陷消除时间要求,严重缺陷消缺时间不超过48小时
某新建房屋为四层砌体结构,设一层地下室,采用墙下条形基础。设计室外地面绝对标高与
以下性粒细胞白血病骨髓象的叙述是A.骨髓增生明显活跃至极度活跃 B.粒红比例下
下列各项中.判断行业所处生命周期阶段的主要指标有( )。A.市场份额 B.需
患儿男,11岁。左下后牙疼4天,夜间加重1天,无龋洞。最可能的诊断 A.急性牙
甲公司是一家致力于打造“全产业链”的集团企业。2019年该公司在原有小麦面粉企业
最新回复
(
0
)