读甲,乙两新工业区分布图,完成下列各题。
育种专家用辐射方法处理大豆,培育成了“黑农五号”等大豆品种,产量提高了16%,含油量比原来的品种提高了2.5%,这种育种方法的原理是( )
下列物品所使用的材料中,不属于有机合成材料的是( )
—You have been sitting on my hat and now it is badly _________.
—Sorry. I will ask my boss for _________ on my salary to buy you a new one.