A:a2b
B:ab2
C:a2+b
D:a2+b2
古代世界人类文明的交流主要有两种形式,即和平交往与暴力冲突,请列举两种方式的代表各三例。
p q en enɡ
区____ 棚____ 其____ 铺____
闻____ 层____ 乘____ 分____
—I haven't been to the science museum for a long time. What about you? — . ________ Could you go with me this weekend?