宁夏平原、河套平原地区最典型的农业类型是( )
A:灌溉农业
B:河谷农业
C:现代农业
D:水田农业
----You park here! Look at the sign, it says “No parking”.
----Sorry, I didn't notice that sign just now.
已知△ABC,以点A为位似中心,作出△ADE,使△ADE是△ABC放大2倍的图形,这样的图形可以作出( )个