单项选择题

It can be learned from the passage that______.

A．it will be difficult for scientists to develop a vaccine for women
B．HIV infects women in the same way with men
C．most women have contracted a variety of HIV from several men
D．it will be easy to develop a vaccine for men

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单项选择题

According to the passage, most women ______.

A．were infected by a single variant of the HIV virus
B．were infected by multiple variants of the HIV virus
C．were stronger than men
D．had anti-body in their body