27. What is the main idea of this passage?
(A) The scientific studies of the human mental processes were great in the past.
(B) The more we know about the mind, the less we are sure of its nature.
(C) The human mind can only be studied through experiment.
(D) Much new knowledge has been added to our understanding of the human mental processes.
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統計: 尚無統計資料
統計: 尚無統計資料