题目

求645763除以7的余数. 答案：【答案】6【解析】当被除数较大时，求余数的一个简便方法是从被除数中逐次去掉除数的整数倍，从而得到余数.可以先去掉7的倍数630000余15763，再去掉14000还余下 1763，再去掉1400余下363，再去掉350余13，最后得出余数是6.这个过程可简单地记成645763→15763→1763→363→13→6.Bob was only seven years old. One night Bob was at home alone while his parents were out for a party. He had often stayed alone before, so he wasn't afraid. As he waited for his parents to return home, he watched a film on TV. His eyes became heavier and heavier as time passed by.Suddenly Bob's eyes opened wide—what was the sound in the next room? Bob heard the window being opened slowly. For a minute, Bob was so frightened that he could not move, and his body felt like ice. He knew that he couldn't lose his head and began to think of the things he could do. Again he heard the sound of someone trying to climb into his home through the window.Bob's drums were standing in the corner near the TV. “Wait, maybe there is something I can do，” thought Bob. He beat on his drums as hard as he could. The sound was so terrible that Bob surprised even himself. He also surprised the man in the window, who ran away as fast as possible.1.What did Bob do when he waited for his parents?A. He played the drums. B. He watched TV.C. He fell asleep. D. He did nothing.2.How did Bob make the man run away?A. He turned up the TV.B. He called the police.C. He beat his drums.D. He asked his parents for help.3.According to the passage, what was Bob like?A. Clever. B. Stupid.C. Friendly. D. Strict.