题目

阅读理解 Mary is having a birthday party. There will be a cakewith candles. Some people will bring birthday presents. Let's look at birthdaysin some different countries around the world. Argentina: Ear pulling.If you ate 13, they will pull your ear. They will pull your ear one time for eachyear of your age. If you are 13, they will pull your ear thirteen times. Denmark: Flag (旗). If it is your birthday in Denmark, a flagwill fly outside a window of your home Philippines: Colouredlights. Some people put colored light outside their home if sometime is having abirthday. Russia: Birthdaypies将β－胡萝卜素合成途径中的相关基因导入水稻，可以使米粒中含有β－胡萝卜素，称为“金色大米”。这种“金色大米”形成的全过程中不需要的酶是 (　　)A．限制性内切酶B．DNA连接酶C．RNA聚合酶D．逆转录酶