存储器是计算机系统的记忆设备,它主要用来______。
A.存储程序
B.存储数据
C.存储指令
D.上述B)和C)
参考答案:D
目前,埃及最大的外汇来源是[ ]
A.旅游收入
B.侨汇
C.石油
D.运河
—Look at the young lady in red. Is it Mrs. King?
—No, It ________ be her. She is wearing a white dress today.
A.can
B.may
C.must
D.can’t