单项选择题


Questions 23 ~ 25 are based on the following news from the BBC or the VOA. At the end of the news item, you will be given 15 seconds to answer the three questions. Now listen to the news.
It is estimated that 150,000 women die a year because of ______.

A.unsafe blood
B.risky sexual encounters
C.loss of blood during pregnancy related-illnesses
D.blood transfusions