观察发绀最明显的部位是（）。
A.鼻尖
B.口唇
C.舌
D.颊部
E.甲床
参考答案：B
----- It is 30 years since we last met.
------ But I still remember the story, believe it or not, _________ we got lost on a rainy night.
A．what
B．which
C．where
D．that
简述重要的地球辐射系，地球辐射对人体的照射方式。
