题目内容：
Peter Fischer
A．A rich person is not necessarily happy. B．Things people often overlook may be the very source of happiness.
C．Happiness can be promoted on a scientific basis.
D．We should mainly rely on ourselves for happiness.
E．Happiness lies in giving instead of taking.
F．The environment is a source of happiness.
G．Happiness can be achieved if we stick to the best of our values.
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