单项选择题
In this section, you will hear five short news items. After each item, which will be read only once, there will be a pause. During the pause, read the question and the three choices marked A, B and C, and decide which is the best answer. Then mark the corresponding letter on the answer sheet with a single line through the centre.
Who do International medical guidelines call for to use a combination of AIDS drugs（） A.Pregnant women with AIDS.
B.Pregnant women with AIDS and their newly - born babies.
C.Pregnant women with advanced HIV.