下列贸易术语属于主要运费未付的是（）
A.FAS
B.FCA
C.DAF
D.CPT
E.DDP
参考答案：A, B
There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.
A．to which
B．in which
C．for which
D．on which
什么是油动机？油动机有什么特点？
