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A．minimum
B．maximum
C．scarce
D．sufficient
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单项选择题The gene therapy differs from HAART in that______.

A．HAART is presently employed as a drug-based treatment
B．the gene therapy plays a minor role in relation to HAART
C．the gene therapy can stop HIV infection from becoming full-blown AIDS
D．HAART may produce questionable results, while gene therapy will certainly not

单项选择题What is the passage mainly about

A．AIDS study raises hopes for gene therapy treatment.
B．A new killer of HIV virus.
C．Research on gene therapy.
D．Gene therapy proves to be the ultimate solution to HIV infection.