---They want to know _________ for the airport tomorrow. --- Early in the morning. A. when will you leave B. when you will leave C. when do you leave D. when you leave 答案:B一U型管中装有两种不同的溶液R和S(R溶液为10%的蔗糖溶液,S溶液为10%的葡萄糖溶液,两者均不能透过半透膜X),两溶液被一半透性膜X隔开,如右下图所示。当U形管内达到平衡时,液面与浓度的关系应是( ) A.右侧较高,两溶液浓度相等 B.左侧较高,且右侧浓度较低C.右侧较高,且右侧浓度较高 D.两侧高度相等,浓度相等