Most American families are smaller than the families in other countries. Children in the USA will leave their parents when they grow up. They usually live far from their parents because they want to find good jobs. They often write to their parents or telephone them. And they often go to visit their parents on holidays.

    Parents usually let their children choose their own jobs. Americans think it is important(重要的) for them to make decisions(作决定).

    Children are also asked to do some housework at home. And in many families，children will get money from their parents for doing some housework. Because American parents want to let their children learn how to make money for their own use.

如图为桑基鱼塘的物质和能量交换模式图，据图回答：

（1）该生态工程体现了____ 等生态工程的基本原理（选答两项）．

（2）通过现代生物技术可提高传统生态工程的效益，要通过基因工程培育抗病甘蔗，需要的工具酶是____ ，可通过____ 技术将导入了目的基因的甘蔗细胞培养成植株． 若要检测转基因甘蔗细胞染色体上是否插入了目的基因，可采用____ 技术．

（3）为大量繁殖良种猪，可采用胚胎移植技术．该技术首先要对母猪注射____ ，做超数排卵处理，以获得更多的良种猪卵母细胞，然后培养到____ 期，与经过____ 处理的良种猪精子进行体外受精．将早期胚胎移植到本地母猪体内发育成小猪．受体对移入子宫的外来胚胎基本上不会发生____ 反应，为胚胎在受体内的存活提供了可能．

比较$\frac{1}{11}$+$\frac{1}{33}$和$\frac{1}{12}$+$\frac{1}{29}$的大小．