单项选择题
A.He had nothing else to do, B.He wanted to prevent young people from getting into gangs. C.He wanted to get rich. D.He wanted a Noble Priz
A.2,000,000 B.200,000 C.400,000 D.2,000, 000,000
A.very short B.about 1.5 hours at a time C.about 12 days D.a day long