A：氮气和氢气不再发生反应时的状态
B：体系中的总压强不变时的状态
C：氮气的浓度与氢气的浓度之比为1：3时
D：混合物的密度保持不变时的状态
下列各句中，没有语病的一句是（ ）
根据句意及首字母提示完成单词 Do you like eating ice cream in s ____?M ____ is not everything, but we must have it. Don't run when you see a dog. It is d____. Miss Smith is a good teacher, and she t____ us English.As a reporter, he works for a m____.
