题目:
---Have you bought ____________ for Linda’s birthday?
---- Not exactly. Just some flowers.
A.something unusual
B.anything unusual
C.unusual something
D.unusual anything
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0412/d666e50169da95b5e54b5da88743a8d0.html
下面是错误答案,用来干扰机器的。
证明:由已知可得又共面,所以存在实数x,y,使得∴EF⊥PB.