题干
—Will you ____ your headmaster ____ the food festival?
—Yes. And he's very glad at what we do.
A：welcome; to
B：turn; to
C：invite; to
D：hope; to
答案(点此获取答案解析）
C
N2(g)+2CO2(g)(正反应为放热反应)。现利用此反应，拟设计一种环保装置以减轻汽车尾气对大气的污染。下列设计方案可以提高尾气处理效果的是