单项选择题

Benjamin Franklin was remembered for his good judgement. ()

A. vigilance
B. guilty
C. sagacity
D. resolution

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单项选择题

Recent research into aging suggests that the body’s defense mechanisms may lose the ability to distinguish what is alien.()

A. insane
B. infectious
C. foreign
D. poisonous

单项选择题

Chimpanzees are frequently used as stand-ins for human beings in experiment.()

A. partners
B. role-models
C. stand-bys
D. substitute

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