单项选择题

Virallyinfected host cells are tagged with antigen-antibody complexes. These complexes recruit NK cells that trigger apoptosis in theinfected host cell.This is an example of: ____

A．antibody-dependent cell-mediated cytotoxicity
B．antigen presentation
C．complement fixation
D．neutralization
E．opsonization

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单项选择题

胸闷重而心痛轻，形体肥胖，痰多气短，倦怠乏力，口粘，恶心，苔白腻，脉滑，证属痰浊闭阻。 A. 对 B. 错

The fibrocarti'laginous callus is converted into a bony callus of ____ bone.

答案： spongy