车辆蓄电池外部不清洁，易造成正、负极接线柱间导通，导致蓄电池（）。
参考答案：自放电
冰岛首都雷克雅未克主要利用______资源为当地居民提供能源，是世界上著名的“无烟城市”。
A．森林
B．石油
C．地热
D．煤
I don't think Mr. Tyler's lecture _____ the student , for they appeared quite puzzled. [ ]
A. got across to
B. got through
C. turned to
D. caught up with
