What depressed her was that although she kept waving her hand, nobody seemed _______ her new watch.

A．noticing

B．to have been noticed

C．to have noticed

D．having noticed

Ⅰ型变态反应可通过下列哪种成分转移给正常人（）。

A.患者的致敏淋巴细胞

B.患者的血清

C.致敏淋巴细胞释放的转移因子

D.巨噬细胞释放的淋巴细胞激活因子

E.患者的中性粒细胞