单项选择题

The WHO says millions of people are at risk______.

A．from unsafe blood
B．from malaria
C．from risky sexual encounters
D．from AIDS
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单项选择题
New figures published by the World Health Organization show ______. of all donated blood isn't tested.
A．15%
B．20%
C．25%
D．30%
单项选择题
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
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