下列物质的用途中，主要利用其物理性质的是（　　）

A．碳酸氢钠用于治疗胃酸过多

B．干冰用于人工降雨

C．熟石灰用于改良酸性土壤

D．稀盐酸用于除铁锈

A.It was great. B.What’s the matter C.How about the green one
D.Are you free tomorrow E.Thanks,but I am full.

A:How was your trip to Beijing
B:______I spent four days in Beijing. Every day I did something different.