题干
The teacher as well as all the boys ____ to play basketball every Sunday afternoon.
A：is going
B：go
C：goe
D：are going
答案(点此获取答案解析）
A
+
=1上一点P到左焦点F1的距离为2，M是线段PF1的中点，则M到原点O的距离等于 （ ）