题目

爷爷质量比小丽大，如图，小丽和爷爷一起用相同时间爬完相同的楼梯，则（   ） A . 小丽做的功较多 B . 小丽做的功和爷爷做的一样多 C . 小丽做功比较慢 D . 小丽做功的功率和爷爷做功的功率一样 答案：CLong before Barack Obama became president of the United States, he wrote a book 【1】 (call) Dream from My Father: A Story of Race and Inheritance, which has since become 【2】 bestseller. It is an 【3】 (appeal) book that includes what he went through during 【4】 (he) childhood. Obama has little contact with his father 【5】 roots were in Kenya because he left home when Obama was very young. His mother got married 【6】 a student from Indonesia shortly after the family moved to Jakarta. A few years later, Obama came back with his grandparents to Hawaii, where he 【7】 (attend) a private high school. 【8】 (study) at Columbia in New York City, he then entered Harvard Law School. This autobiography also touches 【9】 (heavy) on Obama’s exposure to racism. Readers will find his reflections of childhood 【10】 (experience) which involved racial discrimination to be especially moving.