题目

读句子，选中文，填字母编号。⑴What's near the light? A.什么在门后？⑵A ruler. B.什么在床上？⑶What's on the bed? C.什么东西靠近灯？⑷A schoolbag. D.一把尺子。⑸What's behind the door? E.一只狗。⑹A dog. F.一个书包。 答案：【1】C【2】D【3】B【4】F【5】A【6】E单项式-2ab2的系数是 ，次数是 ．