血液的组成包括（　　）

有一只电子钟，每9分钟亮一次灯，每个整点响一次铃．上午8时电子钟既响铃又亮灯，下一次既响铃又亮灯是____ 时．

    Helen Keller lived in the USA. When she was a baby, she got very sick. After she was better, she couldn't and hear well. A few years later, things got worse. There was no way for Helen to speak to other people. She heard nothing. She saw nothing. She didn't understand anything.

    One day a teacher came to live with Helen and her family. The teacher helped Helen learn about words. Helen was such a bright girl that she could spell her first word soon. When she was older, she went to college.

    Helen became very famous later. She traveled around the world and helped many blind and deaf people. The world remembers her today as a brave and wonderful person. She was blind and deaf, but she found a way to see and hear.