单项选择题

A．It has numerous traits in common with the spotted owl.
B．Its population is increasing in recent years.
C．It may not survive without special efforts of conservationists.
D．Its role in the chain of evolution has not yet been examined.
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单项选择题
A．They like to have music in the operating room.B．They solved problems better while listening to music they liked.C．They preferred classical music.D．They performed better when they used headphones.
A．They like to have music in the operating room.
B．They solved problems better while listening to music they liked.
C．They preferred classical music.
D．They performed better when they used headphones.
单项选择题
A．With an increase in the amount of blood.B．With more muscles.C．With vigorous trial.D．With routine exercise.
A．With an increase in the amount of blood.
B．With more muscles.
C．With vigorous trial.
D．With routine exercise.
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