单项选择题


A．critical
B．serious
C．valuable
D．boring
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单项选择题
A．manyB．goodC．fewD．no
A．many
B．good
C．few
D．no
单项选择题
According to the passage, what is the difference between a homing pigeon and an ordinary one
A．The span of the wings.
B．The color of the feathers.
C．The size of the head.
D．The size of the brain.
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