坐在匀速行驶的火车车厢里的乘客，相对下列哪个参照物是静止的：[ ]
A．车外的树木
B．关着的车门
C．列车里行走的列车员
D．列车的轨道
B
下列离子方程式正确的是（ ）
A．铁粉加入三氯化铁溶液中：Fe+Fe3+=2Fe2+
B．钠与水的反应：Na+2H2O═Na++2OH-+H2↑
C．铜片插入硝酸银溶液中：Cu+Ag+═Cu2++Ag
D．大理石溶于醋酸的反应：CaCO3+2CH3COOH═Ca2++2CH3COO-+CO2↑+H2O
I like to talk _____ my father ______ basketball at home in my free time.
A．about; about
B．about; with
C．with; with
D．with; about
