[单项选择]In radio and television ______ impossible to draw the line between news and entertainment programs. A. frequently is B. are frequently C. it is frequently D. where they are frequently
第15题: [单项选择]Most supermarkets need a very spacious floor area, sometime ______ that of an ordinary shop. A. at least ten times as big as B. at least as ten times big as C. at least as big as ten times D. ten times as at least big as 参考答案:A 答案解析:at least ten times as big as an ordinary shop含义是“大小至少是普通商店的十倍”,符合题意,因此选A。