【单选题】As a general statement, it is safe to say that businesses generally use the ________ for foreign currency option contracts, and individuals and financial institutions typically use the ________.
【简答题】A.The sea can hardly be trusted even on a fine day. B.It is not safe for people to go boating in the open sea. C.People who know the sea well do not like it. D.Mr. Johnson wouldn't want to go to the s...