读世界部分地区图，回答下列问题．
(____) He is making a birthday card.
(____) He's in his room.
(____) When is Jack's birthday?
(____) Where's Jim?
(____) Who is he making it for?
(____) What is he doing?
(____) Tomorrow.
(____) He is making it for his friend，Jack.
下列不是由地球公转引起的现象是（ ）
老师做了一个物理小实验让学生观察：一轻质横杆两侧各固定一金属环，横杆绕中心点自由转动，老师拿一条形磁铁插向其中一个小环，后又取出插向另一个小环，同学们看到的现象是（ ）
