阿片受体拮抗剂是
A．纳洛酮
B．芬太尼
C．哌替啶
D．喷他佐辛
E．美沙酮
参考答案：A
Oh, boy, why are you killing your time this way? Can’t you find something ________ doing?
A．useful
B．deserve
C．valuable
D．worth
罐子ɡuàn zi
