若△ABC∽△DEF,AB:DE=2:1且△ABC的周长为16,则△DEF的周长为( )
A:4
B:6
C:8
D:32
下列诗句中,描述气候的是( )
读近百年来甲、乙两个天然物种生存地域的水平变迁图,完成小题。
细胞膜的功能特性是( )
You'd better not ask too many ____ (private) problems at the party.