题目

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。There may be a new species of fox­like cat.Wildlife rangers(护林员) from France’s National Hunting and Wildlife Agency located 16 of the 【1】(rare) seen golden striped(有条纹的) creatures in mountainous areas of a French island.The cats are 【2】(big) and more aggressive than a typical house cat，and have highly developed teeth and large，ringed tails.Because of the 【3】(appear)，they are known locally as the “cat­fox”．The creature hunts at night and，from the look通过基因工程的方法，使番茄果肉细胞含有人奶蛋白。有关该基因工程叙述错误的是 ( 　)A．采用反转录的方法得到的目的基因有启动子、终止子B．用同种限制酶处理质粒和含目的基因的DNA，可产生相同的黏性末端而形成重组DNA分子C．番茄的叶肉细胞可作为受体细胞D．启动子对于目的基因在番茄的叶肉细胞中表达是不可缺少的