题目

--- My son is two years old, but he can _________ draw.    ---How clever! A. teach himself to                  B. teach to himself    C. learn by himself                  D. study with himself 答案：Am g二氧化锰与一定体积的浓盐酸反应，得到nL氯气（标准状况），可确定该反应中被还原的MnO2的物质的量是A.m/55 molB.m/87 molC.n/11.2 molD.n/22.4 mol