单选题：Many scientists have been probing psychological problems．

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题目内容：
Many scientists have been probing psychological problems． A．solving
B．exploring
C．settling
D．handling
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元认知在学会学习中的作用有起止作用、_________作用和增效作用。

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The Berlin workshop concluded that the real figure______________

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According to the passage，which of thefollowing statements ab

According to the passage，which of thefollowing statements about knitting is NOT

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