People tend to live more happily and longer if they are ________ about life.
A．pessimisticB．enthusiasticC．optimisticD．terrific
C
四個(gè)選項(xiàng)分別表示悲觀的、熱情的、樂觀的和可怕的，根據(jù)題意選C。如果人們對生活樂觀，他們傾向于……。
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