首页
登录
职称英语
25 . A large group of hyperactive children whose regular diets included food con
25 . A large group of hyperactive children whose regular diets included food con
游客
2025-02-26
10
管理
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://tihaiku.com/zcyy/3973615.html
相关试题推荐
Pamela:Businesshasaninterestinenablingemployeestocareforchildren,bec
25.Alargegroupofhyperactivechildrenwhoseregulardietsincludedfoodcon
SoftDrinkManufacturer:Ournewchildren’ssoftdrink,RipeCal,isfortifiedwi
Inmalaria-infestedareas,manychildrentendtosufferseveralboutsofmalaria
TheEnvironmentalProtectionAgencymustrespondtothehazardtochildren’she
Whenagroupofchildrenwhohavebeenwatchingtelevisionprogramsthatinclude
Agroupofchildrenofvariousageswasreadstoriesinwhichpeoplecausedharm
Becauseyoungchildrendonotorganizetheirattentionorperceptionssystematic
Piaget’sresearchrevealedthatchildrencanlearntocountlongbeforethereco
Themistakeschildrenmakeinlearningtospeaktelllinguistsmoreabouthowth
随机试题
Therearetwofamousuniversitiesclose______inthenortheastofthecity.A、in
【B1】[br]【B4】[audioFiles]audio_eusm_j01_266(20099)[/audioFiles]influenced下文中的h
Whichofthefollowingistrueaboutwriting?[originaltext]Writingisaskill,
电梯的主电源开关应设在。A.电梯机房内部 B.能从机房人口处方便地接近的位置
A.红斑 B.斑 C.白斑 D.糜烂 E.溃疡愈合后可能遗留瘢痕的是
对于一组经对数变换后亦不服从正态分布的偏态分布资料描述该组的集中趋势应选用A.频
德国经济地理学家韦伯的工业区位理论强调的是()。A.运输成本对工业区位的影响
促进液体在固体表面铺展或渗透的作用称为()。A.增溶B.乳化C.润湿D.气泡E
海洋性贫血可见A.球形细胞 B.靶形细胞 C.泪滴形细胞 D.红细胞缗钱状
关于厂区总平面布置技术经济指标的说法,正确的是()。A.工业企业内部绿地率
最新回复
(
0
)