“佛光”景观出现的地点有（）。
A.湿润的山区
B.树冠茂密的林区
C.海平面
D.高空云层上方
参考答案：A, B, D
乳牙牙髓感染临床上多为（）。
A.急性牙髓炎
B.慢性牙髓炎
C.逆行性牙髓炎
D.可复性牙髓炎
E.化脓性牙髓炎
— What do you think of electric cars?
— They work well, _____ they are slow and can't run for long.
[ ]
A. and
B. but
C. or
