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
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
2012-06-18
23
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 "
We learn from the last paragraph that in the near future________
选项
A、the garment industry will reconsider the uniform size.
B、the design of military uniforms will remain unchanged.
C、genetic testing will be employed in selecting sportsmen.
D、the existing data of human height will still be applicable.
答案
D
解析
由最后一段的最后一句话,“…you could use today’s data…”,可知D选项符合题意。
转载请注明原文地址:https://kaotiyun.com/show/FSnO777K
0
考博英语
相关试题推荐
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cyclespersecond(cy/sec),Somepeoplecanhearhigherf
Hephonedhisunclewholivedinthecountry,askinghimto______histwoschoolmatesfortheweekend.
Thisdistinguisheddirector______theplotfortheprizewinningfilmwhilehewasstillacollegestudent.
Accordingtothe(literature)inthisfield,expert(evidences)originally(appeared)inEngland,andlater(gotwidenused)in
Throughmicroscopespeoplecanseeobjectsthatare______tothenakedeyes.
Theteacher______fromhercustomandgaveusnohomeworkyesterday.
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousd
Sometimesartistsfindithardfortheirworkstowinpopular______.
LebanonisoneofthefewcountriesintheMiddleEastwithacomparativelywell-developedlabourmovement.Tradeunionshaves
HerofficeintheFirstNationalBankbuildingisprovisional.
随机试题
离心通风机由几个主要部分组成?
Don’tbetoo______aboutthingsyouarenotsupposedtoknow.
女,22岁。因右上后牙残根需拔除该患者颊部肿胀的处理应是
A.囟填B.囟陷C.解颅D.前囟E.后囟
发绀是由于()。
气体反应在密闭容器中反应达到平衡,如果温度不变,但体积缩小了2/3,则平衡常数为原来的( )。
消防验收没有完全通过时,建设单位可以()。
“为人民服务”是毛泽东为纪念()同志提出的。
早上7点两组农民开始在麦田里收割麦子,其中甲组20人,乙组15人。8点半,甲组分出10人捆麦子;10点,甲组将本组所有已割的麦子捆好后,全部帮乙组捆麦子;如果乙组农民一直在割麦子,且假设每个农民的工作效率相同,则捆好乙组所有已割麦子的时间是()。
乡、民族乡、镇的人民代表大会代表每届任期()。
最新回复
(
0
)