零存整取（打一成语）。
参考答案：
积少成多
-------- Selina hasn’t paid for the school things , has she ?
------- _________________. Her father will pay for it .
A．Yes , she has
B．No , she hasn’t
C．Yes , she did
D．no , she didn’t
下列两个二进制数进行算术运算，11101+10011=______。
A．100101
B．100111
C．110000
D．110010
