27. Those who suffer from headache will find they get_____ from this medicine.

26. The officer ______ those who lost sons or husbands in the mine accident last month.

25. Tom is going to talk about the World Expo in Shanghai, but I’d rather he ______ on the World Cup.

24. It’s an old photo of my childhood that I _______ when I was looking for my ID card the other day.

23. The traffic rule says young children under the age of five and _______ less than 25 kilograms must be in a child safety seat.

22. Some pupils are often scared _______ some money in the corner of the streets by a few young men.

第一节、单项填空(共15 小题；每小题1分，满分15分)

从(A，B，C，D)四个选项中，选出可以填入空白处的最佳选项。

21.The visitors are greatly impressed by the fact that_____ people from all walks of life are working hard for _____ new Jilin.

75．(10福建卷)高中生物选修3-- [生物-现代生物科技专题](10分)

红细胞生成素(EPO)是体内促进红细胞生成的一种糖蛋白，可用于治疗肾衰性贫血等疾病由于天然EP0来源极为有限，目前临床使用的红细胞生成素主要来自于基因工程技术生产的重组人红细胞生成素(rhEPO)期间要生产流程如右图

(1)图中①所指的是　　　　　 技术。_K^S*5U.C#O

(2)图中②所指的物质是　　　　　　　　　 ，③所指的物质是　　　　　　　　　 。

(3)培养重组CHO 细胞时，为便于清除代谢产物，防止细胞产物积累对细胞自身造成危害，应定期更换　　　　　　　　 。

(4)检测 rhEPO外活性需用抗rhEPO单克隆抗体。分泌单克隆抗体的　　　　　　　 细胞，可由rhEPO免疫过的小鼠B淋巴细胞与小鼠骨髓瘤细胞融合而成