女，8岁。右下后牙酸甜刺激痛。检查：右下第一恒磨牙近中沟墨浸状，探针被卡住。此牙诊断是
A．浅龋
B．中龋
C．深龋
D．牙髓炎
E．根尖炎
参考答案：B
_______ the water was cold, Wei Qinggang jumped into it to save others. [ ]
A. Although
B. When
C. If
D. Because
沸点最高的溶剂是（）
A.MeOH
B.CCl4
C.EtOAc
D.Et2O
E.H2O
