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
25 . A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed
25 . A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed
admin
2014-10-21
75
问题
25 . A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent of the children exhibited behavior problems; after the change in diet, only 30 percent did so. On the basis of these data, it can be concluded that food additives can contribute to behavior problems in hyperactive children. The evidence cited fails to establish the conclusion because
选项
A、there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake.
B、there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied.
C、exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given.
D、there is no evidence that the behavior of some of the children was unaffected by additives.
E、the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed.
答案
B
解析
当我们想通过比较来研究某一因素对某件事情的影响时,要在保证其他条件不变的情况下,仅改变这一因素来研究它,只有这样我们得到的数据才有可能是可信的。段落中的论据却没有这样做,根据段落中提供的证据,我们不难推出,它是以饮食中包含有较多添加剂的儿童在不改变饮食的情况下,过了几周以后,有行为问题的儿童的比率不变为前提的,也就是说该证据没有用发展的眼光来看待儿童的行为问题。因此当我们用发展的眼光来看待儿童的行为问题时,我们将无法知道若不改变饮食,那些儿童的行为是否也会发生变化。由此分析我们可以得知(B)是正确选项。(A)、(C)和(D)都不是这个证据应该解决的问题;(E)引入了新的比较,因此也是错误的。
转载请注明原文地址:https://kaotiyun.com/show/7StO777K
本试题收录于:
GMAT VERBAL题库GMAT分类
0
GMAT VERBAL
GMAT
相关试题推荐
Iftapwaterwereasdangerousassomepeoplethink,______wouldbegettingsick.
Televisionhasopenedwindowsineverybody’slife.Youngmenwillneveragaingotowarastheydidin1914.Millionsofpeople
Obviously,therewouldbenopointininvesting(投入)inacomputerifyouhadtocheckallitsanswers,butpeopleshouldalsore
Ineverycultivatedlanguagetherearetwogreatclassesofwordswhich,takentogether,comprisesthewholevocabulary.First,
TheannualcampaigntomakeSingapore’sthreemillionpeoplemorepoliteendedyesterdayandwasimmediatelyfollowedbyanother
NotuntilMr.SmithcametoChina______whatkindofacountrysheisfrom.
Whydomendieearlierthanwomen?Thelatestresearchmakesitknownthatthereasoncouldbethatmen’sheartsgointorapidd
Waiter:PrinceWalesRestaurant.Goodmorning!CanIhelpyou?Customer:Yes,Iwouldliketobookatablefortwofortomorrow
Firecanhelppeopleinmanyways.Butitcanbeverydangerous.Firecanheatwater,warmhouses,givelightandcook.Butfire
Inthemostcommonprocedureforharvestingforagecropssuchasalfalfa,asmuchas20percentoftheleafandsmallstemmater
随机试题
类毒素的特点是()
经营现金流量的规模和质量从根本上决定了企业偿还流动负债的能力。
会计信息质量要求原则包括()等原则。
岩溶是可溶性岩石在含有侵蚀性二氧化碳的流动水体作用下形成的地质现象。下面属于岩溶地貌形态的为:
按照规定支付的工程造价管理部门的定额编制管理费,属于工程施工成本中的( )。
商业银行在计量客户违约后的债项违约损失率时,应当包括()。
试述17世纪荷兰绘画的主要成就。
有研究表明,生物大灭绝在历史上发生过二十几次,大约每2600万年发生一次,似乎具有_____。对于物种大灭绝的发生是否真的如此频繁和有规律,还有争议。但即便是最_____的估计,也认为至少有5次物种大灭绝是非常明显的。填入划横线部分最恰当的一项是()。
联合国安理会常任理事国进行决策的规则是()。
“不可能A公司和B公司都没有中标。”如果上述断定是真的,则下述选项中,()必定是真的。
最新回复
(
0
)