反映放射性物质放射性强度的指标是（）
A．照射量
B．吸收剂量
C．放村性活度
D．铅当量
E．剂量当量
参考答案：C
—Could you come to my birthday party?
—______, but I agreed to visit Nancy. [ ]
A. I'd love to
B. Of course not
C. Sorry, I can 't
D. No, thanks
Don’t let ____ in. I’m too busy to see ____.
A．nobody; somebody
B．anybody; nobody
C．anybody; anybody
D．somebody; anybody
