【简答题】CM的主要功能是____,HDL的主要功能是____。
【单选题】I would appreciate________, to be frank, if the goods could be delivered as soon as possible. [ ]
【单选题】If the cross elasticity of demand between goods X and Y is positive and between goods X and Z is negative, then X and Y are ( ) and X and Z are ( ).
A.
price inelastic; complements
B.
complements; substitutes
C.
substitutes; complements
D.
price inelastic; income elastic