喜怒无常的人常常令情绪稳定的人感到困惑。小编带来这篇英语新闻精选，希望大家认真阅读。

英语新闻精选：情绪多变可帮助适应万变的世界

But scientists argue that changing moods - as seen in sulking teenagers, grumpy spouses, orbad-tempered parents - serve an important purpose.

Rather than being a weakness, they are nature's way to of helping us adapt to an ever changing world. So when times are good and spirits are high, we take more risks at a time they are likely to be rewarded.

And when times are tough, sulking can help us conserve our energy.

To take a human example, a stock market trader who makes a successful deal becomes more optimistic about the outcome of his next transaction.

He is then likely to take more risks - as he becomes more optimistic things will go in his or her favour.

The increase in risk taking allows him to make maximum gains at a time when risk taking is most likely to pay off.

This holds true when a variety of different events have an underlying connection, the authors argue.

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