题目

下列生物技术中，属于有性生殖方式的是（ ） A . 克隆 B . 转基因超级鼠技术 C . 葡萄扦插 D . 发酵 答案：B　　阅读理解 　　Mary always wanted to be a singer. Music was the most important thing in her life. But, to tell you the truth, she had a terrible voice. She took lessons for many years, but her voice didn't become better. In fact, it just got louder. 　　Her teacher finally gave up and stopped the lesson, but Mary refused to stop. One day she decided to give a concert and invited her teacher to attend. 　　The teacher was very worried about what to say after the concert. She knew it would be a bad one. 　　At last she got an idea and she went to see her pupil after the concert. 　　“Well,” said Mary, “What did you think of my concert?” 　　“My dear,” said the teacher, “You'll never be better than you were tonight. ” 1．After many years, Mary's voice ________. [　　] A．was the same B．got better C．got nicer D．got louder 2．At last her teacher decided to stop the lesson because ________. [　　] A．Mary was not good at music and had too much trouble B．Mary was good enough to be a singer C．the teacher was going to attend the concert D．Mary herself wanted to stop the lesson 3．Mary gave a concert and asked her teacher to ________. [　　] A．speak B．sing C．teach D．come 4．What the teacher said at last really means ________. [　　] A．Mary did well in the concert B．the concert was terrible and Mary was not a good singer at all C．Mary would be a good singer some day in the future D．Mary sang better this time than before 5．Mary refused to stop. Here “refused” means ________. [　　] A．didn't want B．tried C．couldn't D．happened