明明有20元钱，军军有12元钱，军军要给明明多少元钱，明明的钱才正好是军军的3倍？
（20-12）÷2= 4（元）
Catherine bought a postcard of the place she was visiting, addressed __________ to __________ and then posted it at the nearby post office.
A．it; her
B．it; herselff
C．herself; her
D．herself; herself
细胞外消化
