M: The taxi driver must have been speeding.
W: Well, not really. He crashed into the tree because he was trying not to hit a box that had fallen off the truck ahead of him.
Question: What do we learn about the taxi driver().

A. He turned suddenly and ran into a tree.

B. He was hit by a fallen box from a truck.

C. He drove too fast and crashed into a truck.

D. He was trying to overtake the truck ahead of him.

通过抛补套分析表明非投机性的短期资本流动取决于以下哪些因素（）。

A.利率差

B.外汇资本数额

C.外汇升水幅度

D.外汇贴水幅度

E.汇率高低