我国科学家将一种植物的抗虫基因转入大豆的基因组中，成功培育出一种抗虫大豆新品种．该过程所利用的生物技术是（　　）

   Tom and Gina usually go to school by car .They drive(驾车) pasta cinema a supermarket a post office. The post office is next to the supermarket on Center Street .Mary and Ann usually go to school by bus. They go down Sixth Avenue, past a bank and a library. The bank is across from the library. Jenny usually goes to work by bike,he rides(骑车) past a hotel and three streets．

分式$\frac{b}{a{x}^3}$，$\frac{c}{-3bx}$，$\frac{a}{5a{x}^2}$的最简公分母是（　　）

妈妈去超市买面包，每块面包3元，买了9块，还剩16元钱，妈妈一共带了多少元钱？