切取某动物合成生长激素的基因，用某方法将此基因转嫁到鲇鱼的受精卵中，从而使鲇鱼比同类个体大了3-4倍。此项研究遵循的原理是（   ）

A：基因重组 RNA DNA 蛋白质

B：基因工程 RNA DNA 蛋白质

C：基因重组 DNA RNA 蛋白质

D：基因工程 DNA RNA ____ (cat) life from the camera.

      When Copper ____ (bring) the camera home at the end of the first day, the photos that he took surprised his owner. Many ____ (beauty) pictures filled Cooper's day.

      It is ____ (real) interesting to be able to see the world from a cat's eye. Cooper's owner says that these photos let people see into a cat's world, ____ also help them to learn more about their pets.

       Cooper now has more than 12,000 fans on ____ Internet and has even made TV shows in America.