A teenager is someone who can hear a song by Lady Gaga _______ three blocks away but not his mother ________ from the next door.

A．playing; calling

B．playing; called

C．played; called

D．played; calling

用40cm长的长绳围成一个平行四边形，使长边与短边的比是3：2，则长边是（    ）cm，短边是（    ）cm。