——What does your Chinese teacher look like?
——_________.
A:She likes reading
B:She's tall and thin
C:She's thirty
D:She's very good
今年舟山市汽车保有量已突破十万大关.小明同学家里新购一辆家用轿车如图1所示.
如图,一张矩形纸片ABCD的长AB=a,宽BC=b.将纸片对折,折痕为EF,所得矩形AFED与矩形ABCD相似,则a:b=( )