某学校组织286人分别到徂徕山和泰西抗日英雄纪念碑进行革命传统教育，到徂徕山的人数是到泰西的人数的2倍多1人，求到两地的人数各是多少？设到徂徕山的人数为x人，到泰西的人数为y人，下列所列的方程组正确的是（  ）

已知10^m=3，10ⁿ=2，则10^2m﹣n的值为____ 

若a+b＜0，ab＜0，则下列说法正确的是（　　）

       It was sunny and ____ again at this time of year. John went to the beach to ____ his weekend. He was lying on the sand and ____to music. Suddenly he ____ someone crying for help. He ____ up hurriedly and looked towards the voice. He saw a little boy waving(挥动) his hands in the____a little far away. He ____ off his clothes and jumped into the water____. He swam to the little boy, held him, kept his head ____ the water and swam back to the beach. At last, the boy was safe. He thanked John a____.