Is it big?[ ]
A. Yes, it's very heavy.
B. No, it's very small.
答案:B
小儿断奶时间宜在()
A.4~5个月
B.6~8个月
C.10~12个月
D.12~15个月
E.2岁
给水监测指标是()、()、()、()和()。