第31题:[单选题]Our public transportation is not sufficient for the need of the people in our major cities. A.additional B.efficient C.excessive D.adequate 参考答案:D 本句意思:我们的公共交通运输不能满足大城市里人们的需要。sufficient意为“足够的,充足的”,与adequate(足够的,合乎需求的)意思相近。additional附加的,另外的;efficient高效的;excessive过多的。