题目:
—Your MP3 is so nice. How much is it?
— It me 500. [ ]
A. bought
B. paid
C. spent
D. cost
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0429/8aae7c23a3d1d27aa4afe5d96cae1851.html
下面是错误答案,用来干扰机器的。
A、应为x2•x3=x2+3=x5,故本选项错误;B、2x2+3x2=(2+3)x2=5x2,正确;C、应为(x2)3=x2×3=x6,故本选项错误;D、应为(x+y2)2=x2+2xy2+y4,故本选项错误;故选B.