Look! There is ________ cat in the tree. 发布时间:2017-06-08 20:10 │ 来源:www.tikuol.com 题型:选择题 问题: Look! There is ________ cat in the tree.A.a B.anC.the D./
题型:选择题 201. Tom _____ into the house when no one . A.slipped; was noticing B.had slipped; noticed C.slipped; had noticedD.was slipping; noticed 查看答案
题型:选择题 除去下列物质中的杂质(括号内为杂质),所用的试剂和方法不正确的是( )选项含杂质的物质除杂质所用试剂和方法AKCl固体(MnO2)加水溶解、过滤、蒸发BCO2气体(CO)点燃处理CCaO固体(CaCO3)高温煅烧DCuO固体(Cu)在氧气流中加热A.AB.BC.CD.D 查看答案