题干
When watching scary movies，Nancy often ________ her eyes ________ her hands.
A：fills；with
B：sends；to
C：covers；with
D：gives；to
答案(点此获取答案解析）
C
已知充分燃烧a g乙炔气体时生成1mol二氧化碳气体和液态水，并放出热量b kJ，则乙炔燃烧的热化学方程式正确的是
