学前教育科研中的假设不需要理论或事实的依据。
B;学前教育科研中的假设需要理论或事实的依据。
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Passage 2 Questions 6 to 10 are based are on the following passage. It is difficult to form a correct idea of a desert without having seen one. It is a vast plain of sands and stones, with mountain
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