家政服务员在冬季每周应至少洗澡1次，有条件者可每隔（）天左右即洗澡一次。
A、1
B、3
C、5
D、7
参考答案：B
— Did you scold him for his carelessness?
— Yes, but________ it. [ ]
A. I would rather not do
B. I'd rather not have done
C. I shouldn't do
D. I'd better not do
对某种溶液中的离子进行检验，下述结论中合理的是（ ）
A．先加BaCl2溶液，再加足量HNO3溶液，仍有白色沉淀，则一定含有SO42-
B．加足量的CaCl2溶液，产生白色沉淀，则一定含有CO32-
C．加足量浓NaOH溶液，产生有氨味的气体，则一定含有NH4+
D．先加盐酸使溶液呈酸性，再加足量AgNO3溶液，有白色沉淀，则一定含有Cl-
