房室瓣开始开放的原因是
A.心室舒张,室内压低于动脉压
B.心房收缩,房内压高于室内压
C.心室舒张,室内压低于心房压
D.心房舒张,房内压下降
E.心室收缩,室内压下降
参考答案:C
—So why didn't you say "hello" to him yesterday?
—Well, I stopped and smiled when I saw him, but he _____ me and walked on. [ ]
A. ignored
B. refused
C. denied
D. missed
驾驶机动车违反道路交通安全法律法规发生交通事故属于交通违章行为。