单项选择题


A．when
B．for
C．but
D．that
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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
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%
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