******说：“一切进步文艺，都源于人民、为了人民、属于人民”。这充分说明
①文化创新要着眼于广大人民群众不断增长的精神文化需求
②人民群众是社会实践的主体，文艺工作者是文化创造的主体
③文化创新要关注最广大人民群众的根本利益
④文化创新最终源于人民群众的实践

下列实验操作中正确的是（   ）

当x=____时．代数式5x﹣7与4x+9的值互为相反数．

阅读短文，选择正确的答案。
    Tom went to Beijing by plane on his holiday. Every day he had fun with his parents. They went boating. They saw some elephants. They went swimming. They ate lots of delicious food. They also took many beautiful pictures. They will come back tomorrow. He enjoys his holiday.

关于如图下列说法正解的是（　　）