题目

People in the United States honor their parents with two special days: Mother’s Day, on the second Sunday in May, and Father’s Day, on the third Sunday in June. These days are set aside to show love and respect for parents.They raise their children and educate them to be responsible citizens. They give love and care.These two days offer a chance to think about the changing roles of mothers and fathers. More mothers now work outside the home. More fathers must help with child-care. These two special days are celebrated in many different ways.On Mother’s Day people wear car某工厂为处理含有AgNO3、Cu(NO3)2、Mg(NO3)2的混合物废液,现向其中加入一些锌粉,完全反应后过滤。以下情况不可能存在的是(   )①滤纸上有Ag,滤液中有Ag+、Cu2+、Zn2+、Mg2+②滤纸上有Ag、Cu,滤液中有Ag+、Zn2+、Mg2+③滤纸上有Ag、Cu、Zn,滤液中有Zn2+、Mg2+④滤纸上有Ag、Cu、Zn、Mg,滤液中有Zn2+、Mg2+A.①③B.②④C.①②③D.只有④
英语 试题推荐