题目

Some years ago, writing in my diary used to be a usual activity.I would return from school and spend the expected half hour recording the day's events, feelings, and impressions in my little blue diary.I did not really need to express my emotions by way of words, but I gained a certain satisfaction from seeing my experiences forever recorded on paper.After all, isn't accumulating memories a way of preserving the past? When I was thirteen years old, I went on a long journey on foot in a great valley, well－equipped with pens, a diary, and a camera.During the trip, I was busy recording e如图，⊙O1，⊙O2、相交于A、B两点，两圆半径分别为6cm和8cm，两圆的连心线O1O2的长为10cm，则弦AB的长为A.4.8cmB.9.6cmC.5.6cmD.9.4cm