下列桥梁中，（）属于梁式桥。
A.泉州洛阳桥
B.河北赵州桥
C.北京卢沟桥
D.泉州安平桥
E.贵州风雨桥
参考答案：A, D
该发电厂烟囱的设计高度应不低于
A．50米
B．75米
C．100米
D．150米
— What do you often do __________ classes to relax yourself?
— Listen to music. [ ]
A. over
B. among
C. between
D. through
