关于窦性心动过速的治疗原则，不正确的是（）
A.消除诱因
B.针对病因治疗
C.对症治疗
D.美西律
E.美托洛尔
参考答案：D
I didn't see Lucy at the party last night. Do you know_______?[ ]
A. why didn't she come
B. what happened
C. when would she arrive
D. where she has been
收入差距缩小，（）人口比重上升。
A.中等收入
B.极高收入
C.低等收入
D.高等收入
