2. 外语
  3. An investigation that is______can occasionally yield new facts, even notable ones, but typically the appearance of such facts is

An investigation that is______can occasionally yield new facts, even notable ones, but typically the appearance of such facts is

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问题 An investigation that is______can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.
选项 A、 
B、 
C、 
D、 
E、 
答案B
解析 As the words "can occasionally" and "but typically" indicate, the missing word describes an investigation that contrasts with a "search in a definite direction." Among the answer choices, only "unguided" provides a contrasting description; none of the other choices suggests an appropriate contrast.
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