看图在括号内填上正确的数字：____
— My cousin is good at all his subjects at school, but he never ________.
— What a ________ boy! We should learn from him.
世界上面积最大的大洲是（ ）
如图，△ABC中，DE∥BC，AD：DB=1：2，下列选项正确的是（ ）
