---I      for London to attend a meeting tomorrow. The plane      at 10:20 am.

---Have a good journey!

A．am leaving; leaves

B．leave; leaves

C．am leaving; is leaving

D．leave; is leaving

变性珠蛋白小体的形成是

A．胞浆内存在RNA
B．胞浆内嗜碱性物质因中毒变性
C．不稳定Hb
D．核的碎裂，残存物
E．红细胞膜的异常