题干
Millie's father found ______ last month.
A：such an easy work
B：such an easy job
C：so tough work
D：so tough job
答案(点此获取答案解析）
B
Millie's father found ______ last month.
A：such an easy work
B：such an easy job
C：so tough work
D：so tough job
、
满足
，那么向量
与向量
的夹角为