如图，在⊙O中，AB=CD，则下列结论错误的是（　　）

下列事实不能用金属活动性顺序解释的是（　　）

    Do you like sports? Do you play basketball or baseball in your P.E. class or after school?

    My sister and I like sports very much. (A) We are in our school tennis club__俱乐部）.We play tennis in the morning. It's very interesting. First, we do some exercises(热身练习）.Then, the teacher teaches tennis. We watch him carefully. Later, we play in pairs. Some boys can play very well，but we can't. They often come to help  us. Our teacher is glad to see this. He says our school has many clubs. “Do you like sports?” “Yes，we do, we answer.

    Sports are really fun, and they are good for us.

根据短文内容完成下列任务。

下图中，属于果蝇配子并能形成受精卵的是    (      )

下图为某两日的夜半球示意图，读图完成下列问题。