苯磺隆是我国北方麦田经常使用的一种除草剂，它能被土壤中某些微生物降解，从而减轻对环境的污染，如图是从土壤中分离降解苯磺隆菌株的操作流程图．

（1）微生物生长繁殖所需的主要营养物质有____ 四类，该实验所用的选择培养基是____ ．

（2）与微生物培养基相比，植物组织培养的培养基常需添加的激素有____ ，这些植物激素在添加使用时，如果要达到使细胞既分裂又分化的目的，正确的做法是____ ．

（3）使用接种环进行划线的目的是____ ，划线的操作要求是____ ．

（4）某研究小组采用透明圈法对另一种除草剂甲嘧磺隆的降解菌进行分离筛选，该透明圈是指____ ，对得到的符合要求的菌株应当____

阅读理解

Sarah: What day is it today?

Mike: It's Monday.

Sarah: What do you have on Mondays?

Mike: We have maths, English, art and science.

Sarah: Do you like science?

Mike: Yes, I like art and English, too. What about you?

Sarah: Me too. Who's your science teacher?

Mike: Mr Zhang.

Sarah: What's he like?

Mike: He's old but very kind and funny. He's tall and thin.

Sarah: What do you often do on the weekend?

Mike: I often listen to music and watch TV. Sometimes I draw pictures.