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单选题
But from the start of their experiments, the Wright brothers found that they needed money to pay______their research.
A
back
B
down
C
for
D
off
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单选题From the passage we can infer that.A
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the successful experiments result from perfect scientific meansC
human cases are more effective in observing the brain activityD
the result of scientific research should be set aside for a period of time before it’s applied
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