题目

在采用基因工程的方法培育抗虫棉的过程中，关于导入目的基因的做法正确的是（   ） ①将毒素蛋白注射到棉受精卵中 ②将编码毒素蛋白的DNA序列，注射到棉受精卵中 ③将编码毒素蛋白的DNA序列，与质粒重组，导入细菌，用该细菌感染棉的体细胞，再进行组织培养 ④将编码毒素蛋白的DNA序列，与细菌质粒重组，注射到棉的子房并进入受精卵 A．①②           B．②③           C．③④                D．④①2、以下标有题号的每一行均有一个错误，请找出，并按下列情况改正： 此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。 此行缺一个词：在缺词处加一个漏字符号（^），在该行右边横线上写出该加的词。 此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。 注意：请在答题卡上作答。 A philosophy （哲学）professor walks in to give his class the exam. Place his chair on his desk, the professor says to the class,                             1．           “Use everything you’ve learned in that course to prove this                             2．            chair does not exist.” So, pencils are writing but erasers are                          3．           erasing. The students had a hard time proving that this chair                           4．           doesn’t exist except one student, whom spends thirty seconds                        5．           writing his answer, and then turns his paper, which surprises                          6．           his classmate. Time goes by, and the day comes when all                              7．           the students get their final grades. For everyone’s surprise, the                        8．           student who only wrote for thirty seconds gets a highly mark.                        9．           His answer to the question is “What a chair?”                                                10．