The science of astronomy was begun by amateurs and today remains

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The science of astronomy was begun by amateurs and today remains dependent on their contributions, which are incisive by virtue of being _____ by the a priori assumptions that often vitiate the work of professional research scientists.

A、characterized
B、unencumbered
C、supported
D、contradicted
E、inspired

答案：B

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老师我选的D您讲一下

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