题目

阅读理解 This is a room in Kate’s house.There is a big bed,atable,a computer and some chairs in it.There’s a glass and some books on the table.There is a picture on the wall.Kate is in the room.She is looking at the picture.Her father and mother are in the school.They’re both teachers.They work hard. 1.How many rooms are there in Kate’s house? A.Only one.          B.There is a bed. C.There is a computer.                D.I don’t know. 2.What’s in the room? A.Only a bed.        B.Only a table. C.Only some chairs.               �科学家提供踮S标记的氨基酸培养哺乳动物的乳腺细胞，测量细胞合成并分泌乳腺蛋白过程中各种膜结构的面积变化，结果如下图。下列选项表示a、b、c所代表的膜结构名称以及放射性标记出现的先后顺序，正确的是 A．a核糖体→b内质网→c高尔基体 B．a内质网→b高尔基体→c细胞膜 C．a高尔基体→c内质网→b细胞膜 D．a内质网→c高尔基体→b细胞膜