— What did you buy for your daughter at

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问题选择题

— What did you buy for your daughter at the supermarket?

— I bought _____, because I couldn't find _____ she likes. [ ]

A. something; anything

B. anything; something

C. nothing; anything

D. something; nothing

答案

答案：C

填空题

设M={a|a=（2，0）+m（0，1），m∈R}和N={b|b=（1，1）+n（1，-1），n∈R}都是元素为向量的集合，则M∩N=（）。

判断题

0.5吨CO2可以生成1吨碳氨。