题干
He told me the news，believe it or not，________he had earned＄1,000 in a single day.
A：that
B：which
C：a
D：because
答案(点此获取答案解析）
A
3C(g )+D(g ),若反应开始时充入2 molA和1 molB，达到平衡时C的物质的量浓度为amol/L。若维持容器体积和温度不变，按下列四种配比作为起始物质，达到平衡后，C的物质的量的浓度仍然为amol/L的是( )