Our eating habits are very important for good health and a strong body. There are times when most of us would rather eat sweets and ice-cream than meat and rice. Sweets and ice-cream are not bad if we
Chairman Mao once said,“It is not hard to do one good deed. It is hard to do good deeds all your life.” Guo Mingyi, a 52-year-old worker in Anshan, Liaoning did just that. Over the past 20 years,
There is an endless supply of stories about sleepwalkers （梦游者）．People have been said to climb on roofs, solve mathematical problems, write music, walk through windows, and do murder in the
在点
处的切线与
轴、直线
所围成三角形的面积为
，则
▲ ．
