—Excuse me, is this _______ bicycle?
—No, it isn't. _______ is over there under the tree.
A：your; Mine
B：my; Your
C：her; Her
D：mine; Yours
词语解释：
①光色流荡
②如释重负
( )
设向量a→、b→，满足|a→|=|b→|=1，a→•b→=﹣12，则|a→+2b→|=（ ）
