检查所接受的辅料是否具有药用质量标准或规定的（）。
A.食用标准报告书
B.药检所报告书
C.药监局证明
D.企业证明
参考答案：A
—You look unhappy. What's the matter?
—Well, I like this iPhone 4S very much, but I can't ______ it. It 's too expensive. [ ]
A. pay
B. spend
C. cost
D. afford
— There is somebody at the door, who it be? Is it the postman?
— No, it be him, it's just six o'clock. It's too early. [ ]
A. may; can't
B. may; mustn't
C. will; won't
D. must; may not
