二次函数y=ax²+bx+c的图象如图所示，则关于此二次函数的下列四个结论①a＜0；②c＞0；③b²-4ac＞0；④$\frac{b}{a}$＜0中，正确的结论有（　　）

为下列问句选择合适的应答语。

①Was the magazine interesting? ____ 

②What did Mark do yesterday? ____ 

③How was your stay at the Holiday Hotel? ____ 

④Where did you go yesterday? ____ 

⑤Did you play basketball last weekend? ____ 

北京球迷杨洋深夜收看在美国当地中午举行的一场NBA篮球比赛现场直播．造成两地时间差异的原因是（　　）

    Hello ! My name is LiQiang . There are four people in my family . My father is a worker . My mother is a farmer . My little sister is a pupil. I am a pupil , too . We are in the same school .