属于第二类精神药品品种的是（）
A.甲巯咪唑
B.二氢埃托啡
C.三唑仑
D.麦角新碱
E.艾司唑仑
参考答案：E
关于吗啡，下列叙述不正确的是（）
A.抑制呼吸中枢
B.抑制咳嗽中枢
C.用于癌症剧痛
D.是阿片受体拮抗剂
E.消化道平滑肌兴奋
About 80 percent of the students in our school_____ been working on the program and about two-thirds of the work _____been finished.
A．have; has
B．has; have,
C．have; have
D．has; has
