题目

科学家把苏云金杆菌的抗虫基因导入到棉花细胞中，在棉花细胞中抗虫基因经过修饰后得以表达．下列叙述的哪一项不是这一技术的理论依据（ ） A．所有生物共用一套遗传密码子 B．基因能控制蛋白质的合成 C．苏云金杆菌的抗虫基因与棉花细胞的DNA都是由四种脱氧核苷酸构成的 D．苏云金杆菌与棉花有共同的原始祖先 第二节：短文改错（共10小题，每题1.5分，满分15分） There was no easily way in language learning.     71._______ A good memory（记性）is a great help, and it is       72._______ _ not only to remember rules from a grammar              73. _______ book. There is no much use learning by heart      74. _______ _ many words, study the dictionary and so on               75. _______ _  “Learn through practice”—this is a good           76. _______ _ advice for those learning new language .             77. _______ _ To make great progresses in a language              78. _______ _ learning, we must learn the language by                  79._______ _ speaking and writing as many as we can .            80. _______ _