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
Why do we segregate the old from us according to the conversation
A．Because of prejudice and ignorance.
B．Because of a lack of good alternatives.
C．Younger people sometimes avoid the old to evade fears of aging and dying.
D．All of the above.
单项选择题
What is the speaker’ s job
A．The president of the university.
B．A registrar.
C．The head of the class.
D．A student.
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