题干
Li Lei often takes care of the old woman after school.
A：looks like
B：looks for
C：looks up
D：looks after
答案(点此获取答案解析）
D
Li Lei often takes care of the old woman after school.
A：looks like
B：looks for
C：looks up
D：looks after
CH3COO－ + H+ 的平衡体系中，加入下列物质能使醋酸的电离程度和溶液的pH都变小的是
