根据材料内容选择最佳答案。
Name：Lu Yang
Age：41
Job：Doctor
Family：Mrs Lu is an actress (女演员). They have two daughters. They are happy.
Name：Tian Yu
Age：6
Job：Student
Family：His father is an actor. His mother is a singer(歌手). His sister Tian Miao is nine years old. She is a student too.
Name：Mary Green
Age：54
Job：An English teacher
Family：Her husband Jack is a hotel manager. They have two sons and a daughter.
的值为（ ）
，|q|=3，p、q的
夹角为45°，则以a=5p+2q，b=p－3q为邻边的平行四边形过a、b起点的对角线长为 （ ）