阅读下面材料，回答相关问题．

材料一：南昌西汉海昏侯墓主人身份已经确定为汉武帝刘彻和孙子刘贺．近期，考古工作者又在墓中发现了刘贺的牙齿，专家认为，通过对刘贺的牙齿进行DNA检测，可以开展相关生物学研究．

材料二：我省婺源县境内有典型的、较大面积的天然常绿阔叶林，林内物种多样，生态系统相对未定，为世界级濒危动物蓝冠噪鹛提供了充足的食物来源，是他们生存和繁衍的场所．正所谓“良禽择木而栖”．

Dear Amy,

    Thanks for your letter. It's always nice to hear from you.

    Today is the last day of my exams. The maths exam is very difficult, but other exams are easy. I'mwaiting for the holidays now, and I'm very anxious to see you and to be with you again. I'm going to spend my Christmas and New Year holidays in New York with my sister. I'm going down town. I'm going to go shopping for Christmas gifts. I'm excited about Christmas, and about seeing you again.

                                                                                                                                                                                                        Yours,

                                                                                                                                                                                                           Jack

下图为“理想大陆周围洋流分布的模式图”。读图，回答下列各题。