过敏活性物质阻滞剂作用的靶细胞为()
A.肥大细胞和嗜酸细胞
B.肥大细胞和嗜碱细胞
C.肥大细胞和吞噬细胞
D.吞噬细胞和嗜酸细胞
E.吞噬细胞和嗜碱细胞
参考答案:B
— Anything I can do for you, John?
— Yes, my girlfriend is running her back to me again.
— You _________ your temper. [ ]
A. have always lost
B. are always losing
C. always lost
D. were always lost
珊瑚礁区珊瑚消失后,会出现的后果是()。
A、鱼类也会大量死亡
B、鱼类会大量增加
C、海藻会大量增加
D、尚未发现有明显影响