[racket] Sending s-expr to repl

Scheme newbie here. I've always had a bee in my bonnet for the Lispy languages, but had never gotten into them fully for one reason or another. I've been playing with DrRacket, and have been able to plot graphs using it. Way cool!

Anyway, my actual question is: using DrRacket, is there a way of sending the s-expr at the cursor to the repl, a la emacs? I think that would be a very nice feature.