兄弟三人共同继承父母的遗产，弟弟准备出售自己的份额，哥哥在同等条件下有优先购买的权利。( )
参考答案：对
21. Move a few steps, and the oil-paintings look better ______.
A．in the distance
B．at once
C．in the open air
D．at a distance
