第14题: [单项选择]The scientific group is carrying out a research focused on a drug which is so _______ as to be able to change brain chemistry. A. powerful B. influential C. monstrous D. vigorous 参考答案:A 答案解析:[参考译文] 该科学小组正专注于一项药品研究,这种药品效力极强以致可以改变脑部化学机制。
[试题分析] 此题考查形容词词义。
[详细解答] powerful此处指“(药等)效力大的”,符合本题题意