下列文明的传播,属于和平交流方式的是( )
①阿拉伯数字传播 ②马可·波罗来华
③亚历山大东征 ④大英博物馆陈列圆明园文物
A:①②④
B:①③
C:①②
D:③④
⑴x+46=57
⑵x÷18=90
x+46-46=57○□
x÷18×18=90○□
—I am afraid we can't. _______, we don't have money. Secondly, we're too busy.