Usually what weighs us down are not the burdens of life, but how we handle _______ .

A．this

B．them

C．it

D．us

下列程序段执行以后，内存变量y的值是______。
CLEAR
x=12345
y=0
DO WHILE x＞0
y=y+x%10
x=int(x/10)
ENDDO
y