单项选择题

Before the general election many senior citizens signed the______against the spreading of nuclear arms.

A．contract
B．petition
C．supplication
D．potentiai
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单项选择题
Instead of being situated at a fixed campus, the City University conducts classes at various sites deemed convenient to students.
A．considered
B．located
C．advised
D．modified
单项选择题
A major new area of bioethics is the ethics of health policy and health-resource allocation.
A．exploration
B．expansion
C．distribution
D．possession
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