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问题 选择题

下列反应的离子方程式，正确的是 [ ]

A．向氯化铝溶液中加入过量氨水溶液：Al3++4OH- = AlO2-+2H2O

B．单质铜与稀硝酸反应：Cu+2H++2NO3- = Cu2++2NO↑+H2O

C．氯化铵溶液与氢氧化钠浓溶液混合并加热：

D．向硅酸钠溶液中滴加稀醋酸：SiO32-+2H+ = H2SiO3↓

答案

答案：C

选择题

My mother likes cats very much, so she _____ one at home.  [ ]

A. buys

B. takes

C. makes

D. keeps
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选择题

He is ____________ young ____________ go to school.[ ]

A. so, that

B. too, to

C. to, too
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