北美地区的陆桥运输包括大陆桥运输、小桥运输和微桥运输（）
参考答案：对
心房颤动在老年人群中的发生率约为（）
A.0.5%
B.1%
C.1.5%
D.5%
E.10%
With the college entrance examination near, both the parents and the students are more and more anxious.
A．draws
B．drawn
C．drawing
D．is drawing
