[单项选择]The Panama Canal was constructed in 1915 ______ three hundred fifty million dollars. A. at half cost to B. at a cost of C. at any cost D. at all costs
参考答案:B 答案解析:at a cost Of“耗资”，“以…的代价”；at half cost to“以半价”；at any cost和 at any costs同义，意为“不惜任何代价”，“无论如何”。根据题意和事实，
第31题:[单选题]They bought the land in order to build a new office block. A.with a purpose to B.with a view to C.with a goal to D.with a reason to 参考答案:A 句意：他们买下这块地就是为了盖一幢写字楼。purpose：目的、意图，常用结构：with a purpose to do sth．最符合题意，view：观点，goal：目标，reason：原因。
