A:食醋
B:肥皂水
C:食盐水
D:牛奶
下列各数中,最小的是( )
— I didn't see you yesterday.
— ______ I was ill yesterday, ______ I didn't go to work.
在某一时刻,测得一根高为1.8m的竹竿的影长为3m,同时测得一根旗杆的影长为25m,那么这根旗杆的高度为____ m.