—____ he____in his office in the morning?

—No, ____ ____.

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.

造血干细胞移植是白血病等某些血液病患者治愈的唯一希望。人的造血干细胞产生血细胞的过程在生物学上称为（  ）

如图，有一个边长为 $x$ 米的正方形苗圃，它的边长增加2米．