题目

在前人进行的下列研究中，采用的核心技术相同（或相似）的一组是 ①证明光合作用所释放的氧气来自于水  ②用紫外线等处理青霉菌选育高产青霉素菌株    ③用T2噬菌体侵染大肠杆菌证明DNA是遗传物质  ④用甲基绿和吡罗红对细胞染色,观察核酸的分布 A．①②    B．①③  C．②④      D．③④八、(2014江苏盐城响水，四)A) 根据句意和汉语提示写出单同，完成句子。1. Don't eat too much candy.lt is had for your  (牙齿) .2. Our English teacher is  (幽默的) and we all like him.3. The little girl has two  (微笑) eyes.She looks very lovely.4. That was an unpleasant   (经历) . I don't want to talk about it.5. Mr. Zhang tries his best to work hard in order to  (改善) his life.