题干
— I hate talking with that guy. Look, he is coming. What should I do?
— Don’t speak until ____.
— Don’t speak until ____.
A：speaking
B：spoken to
C：spoke
D：speaking to
答案(点此获取答案解析）
B
B（g）+ 2C（g），且达到平衡。当升高温度时，气体的密度增大，则下列叙述中正确的是（ ）
