题目

—Where        my shoes, Mum? —____ under your bed.  A.is; It’s                  B.is; They’re        C.are; It’s                   D.are; They’re 答案：D已知丙烷的二氯代物有四种同分异构体，则其六氯代物的同分异构体数目有(    ) A.2种              B.3种            C.4种                 D.5种