题目

I was too excited to fall _____. I was still ______ until 11 o’clock last night.   A. sleepy; awake     B. awake; sleep     C. asleep; awake       D. awake; asleep 答案：C下列说法中正确的是A.催化剂在反应前后质量和性质没有发生变化B.红磷在空气中燃烧产生大量的白雾C.硫在空气中燃烧，生成有刺激性气味的气体D.氢气在空气中燃烧产生蓝紫色火焰