the singer and the dancer look 还是look s so young
问题描述：
the singer and the dancer look 还是look s so young
答
应该使用look.
此题涉及主谓一致的问题,有两点原则：
1.并列结构作主语时谓语用复数
例：Reading and writing are very important.
2.当主语由and连结时,如果它表示一个单一的概念,即指同一人或同一物时,谓语动词用单数,and 此时连接的两个词前只有一个冠词.
例：The iron and steel industry is very important to our life.