一面长方形镜子,长4米,宽2米,那么它的周长是______米.
(4+2)×2=12(米);
故答案为:12.
Jane said she________sending e-mails________letters. [ ]
A. preferred; to writing
B. preferred; to write
C. prefers; writing
D. prefers; to writing
简述消费者行为的主要特征。