物体以电磁波的形式向外界传热量的方式称为（）传热。
A.间接
B.对流
C.传导
D.辐射
参考答案：D
When _______ America and Britain, this famous writer said that the same language _____ the two people.
A．talking of; separates
B．talked of; separated
C．talking; separates
D．talks; separates
嘧啶核苷酸从头合成途径中直接合成的核苷酸是（）
A．AMP
B．UMP
C．IMP
D．GMP
