当代资本主义发展进程中出现的新变化及其原因及实质。
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试述第二次世界大战后资本主义新变化的主要表现及其原因。
The ability of a virus to produce disease can result from a variety of mechanisms. Which one of the following mechanisms is LEASTlikely?
A. cytopathic effect in infected cells
B. malignant transformation of infected cells
C. immune response to virus-induced antigens on the surface of infected cells
D. production of an exotoxin that activates adenylate cyclase
E. apoptosis
Reasonable mechanisms for viral persistence in infected individuals include all of the following EXCEPT
A. destroy ofimmune cells by viruses
B. virus-mediated inhibition of host DNA synthesis
C. integration of a provirus into the genome of the host
D. host tolerance to viral antigens
E. mutation of viral antigens
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