如图所示电路中，提供电能的装置是______；要使这个电路中产生电流，必须_________。
电源（或电池）；闭合开关
—Clean-up Day is only two weeks from now. How should we make more people know it?
—We could ______ advertisements after school. [ ]
A. call up
B. hand out
C. put off
D. think up
审美文化
