关于2型糖尿病正确的是（）

A.30岁前发病者多症状严重需应用胰岛素

B.常以慢性并发症为首发症状

C.中老年人多见，从不发生酮症

D.胰岛功能正常

E.老年发病者不需应用胰岛素治疗

The exciting news has spread all over the world______the satellite around the moon succeeded in returning to the earth.

A．which

B．that

C．whether

D．what