The passage is mainly concerned with ______. [br] In the third paragraph, "nor d

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问题 The passage is mainly concerned with ______. [br] In the third paragraph, "nor does giving people breakfast improve performance" means ______.

选项 A、anyone without breakfast does improve his performance
B、not giving people breakfast improves performance
C、people having breakfast do improve their performance
D、having breakfast does not improve performance

答案 D

解析
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