37+5=____
64+8=____
87+7=____
48+9=____
胰岛素是治疗糖尿病的良药,现在科学家将控制胰岛素合成的基因转到能快速繁殖的大肠杆菌内,可获的更多的胰岛素,这种技术属于( )
__________ the west, they have too much sweet food.