题目内容

People tend to live more happily and longer if they are ________ about life.
A．pessimisticB．enthusiasticC．optimisticD．terrific
C
四个选项分别表示悲观的、热情的、乐观的和可怕的，根据题意选C。如果人们对生活乐观，他们倾向于……。
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