麻醉前使用杜冷丁的目的错误的是
A．降低痛阈B．强化麻醉效果C．减轻内脏牵拉反应D．减少麻药用量E．镇静
参考答案：A
He is businesslike and is often _______. I hope he will have more _______ at his business.
A．success; successful
B．successful; success
C．successfully; successful
D．successful; successful
绿色开花植物有几个结构层次、有几种组织？它们分别是
A．5、4
B．4、5
C．4、4
D．5、6
