题干
The teacher walked into the classroom a smile on his face.
A：for
B：of
C：with
D：as
答案(点此获取答案解析）
C
The teacher walked into the classroom a smile on his face.
A：for
B：of
C：with
D：as
Z(g)，反应经60 s达平衡，生成0.3 mol Z 。下列说法正确的是