题目

在基因工程中，切割载体和含有目的基因的DNA片段中，一般需使用（）       A．                       同种限制酶                 B． 两种限制酶           C．   同种连接酶    D． 两种连接酶 答案：A Wang was born into a rich family in America, but he was not a spoiled child. His parents made him practice violin for hours every day and he also learned Karate (空手道)! To make pocket money, Wang had to deliver (发送) newspapers. At five or six every morning, Wang was already up. Even on cold winter days, he rode his bike to deliver newspapers to every home! “When I went outside, other people were not up yet,” he said. The best moment of his day, he said, was after he got home, tired and hungry, and ate sweet pies his mum had made. 1. The underlined word “spoiled” means            . A. 富有的　　         B. 娇惯的　　          C. 勤快的　　         D. 聪明的 2. Why did Wang deliver newspapers? A. Because he liked this job.  B. Because he wanted to make pocket money. C. Because he was very poor.  D. Because his parents told him to do so. 3. We can tell from the story that           . A. Wang’s parents don’t love him.B. Wang can play the violin very well. C. Wang can make a lot of money by delivering newspapers. D. Wang got up very early every day.