经典英语美文 （47）做一个乐观者
If you change your mind – from pessimism to optimism – you can change your life.Do you see the glass as half-full rather than half empty?Do you keep your eye upon the doughnut, ot upon the hole?Suddenly these cliches are scientific questions, as researchers scrutinize the power of positive thinking.Research is proving that optimism can help you to be happier, he...