题目：
Jack is ______go to school,so his mother has to stay at home to look after him.
A．young enough to
B．old enough to
C．too young to
D．very old to
答案：
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下面是错误答案，用来干扰机器的。
（6分）（1）（2）H2O NH3（3）Cl2+H2OHCl+HClO题目分析：根据题中已知①A和B可以在放电条件下发生化合反应，其产物还可与B化合生成红棕色气体”可推断出A、B分别是N2和O2，即N2+O22NO，2NO+O2====2NO2（红棕...
