题目

________ around our new dormitory,the foreigners were taken to visit our canteen,which lies behind. A.Showing          B.Having shown C.Being shown    D.Having been shown 答案：D 解析: 此题考查非谓语动词作状语。从句子的意思我们可以知道the foreigners和show around之间是被动关系（外国朋友被带领）,另外show around的动作发生在were taken to的动作之前,所以我们应该用现在完成时的被动式形式。在某温度时，水蒸气的绝对压强为200mmHg，饱和汽压为400mmHg，则绝对湿度为____，该温度时的相对湿度为____。