問題詳情
【題組】55. We learn from the text that volunteers in the experiment _____.
(A) were patients with bad coughs
(B) were divided into the three groups
(C) received standard treatments
(D) suffered little side effects
參考答案
答案:B
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
用户評論
【用戶】步筱昕
【年級】高三下
【評論內容】从第四段首句Ten healthy volunteers(志愿者) were given theobromine, codeine or placebo, a pill that contains no medicine, during the experiment.可知实验中每组人吃一种所给的物品才能看出止咳的效果,故需要三组志愿者。