①朝鲜爆发内战

②美国出兵侵略朝鲜

③美国侵略军严重威胁中国安全

④朝鲜政府请求中国出兵援助

    Do I like to shop? Of course!  It's fun. Whenever I have free time, I go shopping. There is always something to buy—shoes, clothes, bags, books, etc.

                                                                      --Eileen

    I'm always shopping for my two daughters. Delia, my two-year-old daughter, often needs clothes or shoes. Jodie, my ten-year-old daughter, needs things for school. Do I ever shop for myself? Who has time? Is it fun? No way!

                                                                         Jane

    I don't care about clothes and luckily, I don't need to shop for my food. The only kind of thing I need to buy myself is about music.

                                                                         Nigel

    I like spending my flee time on something fun. To me, shopping is a necessity, not a pleasure (乐趣). I would like to dance, talk with my friends or play chess in my free time. I only shop when I have to.

                                                                         Louis

根据材料内容选择最佳答案。

果蝇的体细胞含有8条染色体｡现有一个果蝇体细胞,它的每条染色体的DNA双链都被³²P标记,如果把该细胞放在不含³²P的培养基中培养,使其连接分裂,那么将会在第几次细胞有丝分裂中出现:每个细胞的中期和后期都有8条被标记的染色体

中华民族是由五十六个民族组成的大家庭，历史上的“五胡”指哪五个少数民族。

（2015•百色）下列能源中，属于可再生能源的是（　　）