对于患重症白血病的儿童的治疗方法中，骨髓移植是其中可考虑的方法之一，原因在于骨髓中具有（　　）

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过15个字。

他人指正，吾必改之。____ 。错误是不可避免的，百密必有一疏。所以别人或好意或恶语的指正均是一把刻刀，为你____。“今日他人之对我抛砖，乃是他日我成才之奠基。”马云谈笑别人对他的指正、批评甚至诽谤。正是他____，使得阿里巴巴蒸蒸日上。

男性和女性最重要的生殖器官分别是（      ）

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Hello! I'm Jane from Canada. I like my school a lot. It's not big 1 it's very nice. All my teachers and classmates are 2 to me. I love3 very much. We study English, math, art and some other 4. Some subjects are  5, but some of them are boring. Of all of them, I like 6 best, because I like drawing pictures. Oh, my favorite 7 are Tuesday and Friday. On these     8 days, we have art lessons. I don't like politics 9 it's boring and difficult.

    My friend Susan 10 at my school. I often go to school with her. She likes politics. She thinks it's easy.