Half of the subjects in an experiment--the experimental group--consumed large quantities of a popular artificial sweetener. Afterward, this group showed lower cognitive abilities than did the other half of the subjects--the control group--who did not consume the sweetener. The detrimental effects were attributed to an amino acid that is one of the sweetener's principal constituents.
Which of the following, if true, would best support the conclusion that some ingredient of the sweetener was responsible for the experimental results?
(A) Most consumers of the sweetener do not consume as much of it as the experimental group members did. (B) The amino acid referred to in the conclusion is a component of all proteins, some of which must be consumed for adequate nutrition. (C) The quantity of the sweetener consumed by individuals in the experimental group is considered safe by federal food regulators. (D) The two groups of subjects were evenly matched with regard to cognitive abilities prior to the experiment. (E) A second experiment in which subjects consumed large quantities of the sweetener lacked a control group of subjects who were not given the sweetener.
Half of the subjects in an experiment--the experimental group--consumed large quantities of a popular artificial sweetener. Afterward, this group showed lower cognitive abilities than did the other half of the subjects--the control group--who did not consume the sweetener. The detrimental effects were attributed to an amino acid that is one of the sweetener's principal constituents.
一半的项目小行了巨大的人工S，冲突能力低比不消耗S的，这个效果因为A这个酸（S含的）
Which of the following, if true, would best support the conclusion that some ingredient of the sweetener was responsible for the experimental results? 支持S对实验有好处
(A) Most consumers of the sweetener do not consume as much of it as the experimental group members did. 消耗S的量比，无关 (B) The amino acid referred to in the conclusion is a component of all proteins, some of which must be consumed for adequate nutrition. 无关，A酸的组成，无关 (C) The quantity of the sweetener consumed by individuals in the experimental group is considered safe by federal food regulators. 俺不安全，无关 (D) The two groups of subjects were evenly matched with regard to cognitive abilities prior to the experiment. 2组实验前的C能力，沾 (E) A second experiment in which subjects consumed large quantities of the sweetener lacked a control group of subjects who were not given the sweetener. 第二次实验，范围错，无关 选D