Directions: After reading the following passage, you will find 5 unfinished statements or questions, numbered 1 to 5. You should make the best choice from the choices marked A,B,C and D. Business English Correspondence(通信,信件) is one of the core business courses for the students who major in English of foreign trade. It is a course that combines English with foreign trade business. This course will help students improve their English as well as their professional ability in foreign trade by introducing various business correspondences and writing formats. Business English Correspondence is the core course of business English, it begins at the fourth term. Students can learn the common vocabulary and writing format through the study of this course. This course is of great importance for students to deal with the foreign trade in future. The goal of this course is to make students learn the standard format of foreign business correspondence and make them know the ways of developing new customers and new markets. It also teaches students how to send an enquiry( 询问) of certain commodity, how to make a request, how to flexibly use the method of payment, how to obey the contract, how to check over the letter of credit(信用证) so as not to make any mistake in a foreign trade transaction(交易).