单项选择题

A．At
B．Under
C．By
D．Over
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单项选择题
According to the passage, what animals are often used by scientists to learn about man
A．Mice.
B．Rats.
C．Monkeys.
D．All of the above.
单项选择题
A．as well asB．might as wellC．as wellD．well as
A．as well as
B．might as well
C．as well
D．well as
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