题干
22. _____ computer has been proved to be _____ important aid in classroom teaching.
A：The; a
B：The; the
C：A; the
D：A; /
答案(点此获取答案解析）
A
A：The; a
B：The; the
C：A; the
D：A; /
2SO3(g)，能增大正反应速率的措施是（ ）