专题与语文实践活动。又快要到腊梅飘香的季节了，阅读下列有关“梅”的几则材料，回答相关问题。
材料一:梅,是我国特有的花卉,迄今已有3000多年的历史。梅,树姿苍劲,铁骨铮铮,疏影横斜,暗香浮动；花态文雅,婀娜多姿,高雅清秀,生机盎然。于隆冬百花凋零之时,仍傲然挺立,喷红吐绿,向人们展示出春光明媚,妍丽动人的景象。在《群芳谱》中,梅花位列“花魁”,更有花中“四君子”和“岁寒三友”的美称。
材料二：一组梅花图

材料三：与梅花有关的典故。著名的有被誉为“梅隐”的宋代诗人林逋,性情高洁,结庐西湖孤山,以植梅畜鹤为乐,终身不仕不娶,而以梅鹤为伴，因而传有“妻梅子鹤”的千古佳话,梅之名因而益彰。“望梅止渴”说的是三国时期曹操行军失汲道，士兵口渴难耐，步履艰难。曹操急中生智，说“前有大梅林，梅子甘酸，可以解渴”，士兵闻之，口皆出水，精神大振，终于摆脱了困境。
材料四：与梅花相关的诗句：①墙角数枝梅，凌寒独自开，遥知不是雪，为有暗香来。（王安石《梅花》）②零落成泥碾作尘，只有香如故（陆游的《卜算子·咏梅》）③不用人夸颜色好，只留清气满乾坤（元代王冕的《墨梅》）等。

根据短文内容，完成下面的任务。

Dear Grandma,

    How are you? I am very busy this month. (A)September 5th is my good friend Gina's birthday. I will go to her birthday party in the evening. On the eleventh, (B)我有一个英语测试. On September 17th, I have a baseball game. You know I love baseball. On the 24th, I have a school trip. On the 28th, I'll go to Mr. Cool's Clothes Store. The clothes there are on sale that day. I want to buy a pair of sports shoes and a T-shirt. The hats there are very nice. I will buy one ① ________ you. Oh, Grandma, I'm very sorry I can't go to see you ② ________ my parents this month. See you next month.

 Yours,

Eric

南北半球的分界线是    (   )