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
2024-01-13
29
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/3359053.html
相关试题推荐
Ourchildrenandgrandchildrenwill______ifwedon’tlookafterourplanet.A、e
Undernocircumstance______totellliestoparents.A、childrenareallowedB、are
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,the
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,the
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,the
Leadingcadreslaunchrectificationcampaignsatregular____________tohearthe
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,
AstheTitanicwassinkingandwomenandchildrenclimbedintolifeboats,
随机试题
[originaltext]Choosingwhattoeatseemslikeasimpledecision,butvariou
[originaltext]W:Darling,Ifeelhungrynow.Howaboutyou?M:SodoI.Letmecal
关于土的标准贯入试验,下列何种说法是不正确的?()A.打击触探杆的穿心锤质量
近期,我国批准成立了一些消费金融公司,向个人和家庭提供消费贷款。消费贷款之所以有
强迫症状主要见于下列疾病A.精神分裂症 B.抑郁症 C.神经衰弱 D.恐惧
男,29岁,风湿性心脏病15年,平时一般活动症状不多。2天来明显心悸,稍事活动即
英文缩写词"DHA"的中文全称是A.二十二烷六烯酸 B.熊去氧胆酸 C.去甲
下列四个选项的图形中,能由所给图形转动而成的是: A.如上图所示 B.如
社会治安秩序是指( )A.社会秩序 B.生产秩序和工作秩序 C.人民群众生
某药材略呈圆柱形或半球形,体轻,质松而韧,横断面可见外层为海绵状物,内层为许多放
最新回复
(
0
)