内毒素叙述错误的是（）

A.来源于革兰阴性菌

B.其化学成分是脂多糖

C.性质稳定、耐热

D.菌体死亡裂解后释放出来

E.能用甲醛脱毒制成类毒素

—What’s up? Could you tell me what’s        ?

—Something is wrong with my MP4. I will get it         after school.

A．happened, repair

B．be happened, repairing

C．happening, to repair

D．happening, repaired