首页
登录
职称英语
In the early 1960s Wilt Chamberlain was one of only three players in th
In the early 1960s Wilt Chamberlain was one of only three players in th
游客
2024-08-09
6
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, 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.ClaireC.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 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."
People of Different Heights
Wilt Chamberlain is cited as an example to illustrate 【B1】___________the height of NBA players.
Living【B2】___________play a key role in body growth according to the text.
The author would most probably agree that human height is conditioned by the【B3】___________.
We learn from the last paragraph that in the near future the existing data of 【B4】___________will still be applicable.
The text intends to tell us that Americans have reached【B5】___________limit. [br] 【B3】
选项
答案
upright posture
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3712473.html
相关试题推荐
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersinth
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersinth
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersinth
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersinth
Intheearly1960sWiltChamberlainwasoneofonlythreeplayersinth
随机试题
[audioFiles]2018m3x/audio_ezfj_ezflisteningd_201803_174[/audioFiles]SpaceG
Thereareactuallytoomanyopportunitiestolearnmore,toseemore,andtound
Manycriticsconsiderthatfarmorestressisplacedonachievementsinat
Theconceptionofpovertyandwhatto【C1】______aboutithavechangedoverth
某被估企业的年净利润为100万元,评估基准日资本市场上同类企业平均市盈率为15倍
导游在向游客介绍八郎之前,讲“八郎山美、水美、石美,是一个独特的民族村寨”。这种
关于污水水质指标类型的正确表述是:A.物理性指标、化学性指标 B.物理性指
某种理想气体分子的麦克斯韦速率分布曲线如图1所示,图中A、B两部分面积相等,则v
某人说闭上眼睛能看到东西,用脑子能听到声音,这种症状属于()单选A.思维形式障碍
土路基填土宽度每侧应比设计宽度宽()。A.200mm B.300mm C.
最新回复
(
0
)