单项选择题

A．Tears.B．Breast milk.C．Saliva.D．Nervous system tissue.……

Questions 14 ～ 16 are based on the following talk. You now have 15 seconds to read Questions 14 ～ 16.
Which of the following has been proved to transmit HIV

A．Tears.
B．Breast milk.
C．Saliva.
D．Nervous system tissue.

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