题目

在Al2(SO4)3和MgSO4的混合溶液中，滴加NaOH溶液，生成沉淀的量与滴入NaOH溶液的体积关系如图所示，则原混合溶液中Al2(SO4)3与MgSO4的物质的量浓度之比为() A . 6∶1 B . 3∶1 C . 2∶1 D . 1∶2 答案：D 30. It looks ______ you are ill. You should go to see the doctor.    A. as        B. as though        C. as well       D. even though