题目

It was a quarter past nine as Marie hurried into the office building where she would be working. Her bus had inched along through heavy morning traffic, making her a few minutes late for her very first job. She decided she would start out half an hour earlier the next day. Once inside the building, she had to stand at the lifts and wait several minutes before one arrived. When she finally reached the office marked “King Enterprises(公司)”, she knocked at the door nervously and waited. There was no answer. She tapped on the door again, but still there was no reply. From inside th3．若用“①②③―→④”表示植物组织培养过程。请回答： (1)①表示__________，被培养成④的原理是__________。 (2)②表示__________，其细胞特点是 ________________________________________________________________________。 (3)若想制备人工种子应选用__________(填标号)。 (4)若①为花药，则是__________，这项技术可用于__________。 (5)若①是胡萝卜根尖细胞，则培养成的叶片的颜色是__________，说明根尖细胞__________________________________________________。 (6)若用此项技术制造治疗烫伤、割伤的药物紫草素，培养将进行到__________(填标号)。