如图所示，三个质点a、b、c质量分别为m₁、m₂、M，（M＞＞m₁，M＞＞m₂）．a、b在同一平面内绕c沿逆时针方向做匀速圆周运动，它们的周期之比T_a：T_b=1：k．（k＞1，为正整数）从图示位置开始，在b运动一周的过程中，则（   ）

    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.

如图为人体某部位的血管，箭头表示血液流动方向，下列说法错误的是（　　）