题干
—Putting on a happy face not only helps us make friends but also makes us feel better.
—______.
A：I’m with you on that
B：I’d love to
C：It’s up to you
D：It’s my pleasure
答案(点此获取答案解析）
A
B. 
C. 
D. 
E. 
CH3COO-＋H+已达平衡，若要使醋酸的电离平衡向左移动和溶液的pH值都减小，应加入的试剂是