下列有关平面向量分解定理的四个命题中：
①一个平面内有且只有一对不平行的向量可作为表示该平面所有向量的基；
②一个平面内有无数多对不平行向量可作为表示该平面内所有向量的基；
③平面向量的基向量可能互相垂直；
④一个平面内任一非零向量都可唯一地表示成该平面内三个互不平行向量的线性组合．
正确命题的个数是（ ）
A：1
B：2
C：3
D：4
在十二届全国人大五次会议上，国务院总理提出推进健康中国建设。城乡居民医保财政补助由每人每年420元提高到450元，同步提高个人缴费标准，扩大用药保障范围。在全国推进医保信息联网，实现异地就医住院费用直接结算。这一承诺（ ）
①有利于广大人民群众共享改革发展成果 ②能进一步促进社会公平
③能够更好保障公民的健康权利 ④能够从根本上解决老百姓看病难的问题
Ken is my friend. He ____ (come) from London, UK. Five years ago I ____(meet) him at Lily's party. Then we ____ (become) good friends. Ken and I ____ (reach) Washington D.C. at the same time. We____ (start) to study medicine in the same school. Now we are still studying together. So I know more about him. Ken is funny He often ____ (make) up some interesting stories to make me laugh. He says he's not going to be a doctor when he graduates (毕业). He ____ (want) to be an actor. He ____ (take) acting lessons when he is free. He ____ (make) lots of funny movies to make people happy. I believe his dream ____ (come) true.
