Language Points | Translation | Comprehension Questions Text A    Why People Travel?     Why do we still take business letters as the main means of business communications today? What kind of business letters do you think are the most polite and respectful form of business communication?ª¤ Why do we say letter writing is the most natural kind of composition? What necessary parts does a well-constructed business letter consist of? What's the purpose of using the heading in a business letter?       Because high standards in an organization correspondence suggest high standards in business, and a well-presented business letter may lead to an important business contact. Neatly typed and properly worded official letters signed by the chief executive officer of the sending party are still regarded by the receiving party as the most polite and respectful form of business communication. Well, you can not find the answer from the text. Do you have any ideas?     I think it a natural way to communicate with others, to enhance the intimacy between your friend and you. Every well-constructed business letter is made up of ten essential parts, namely the heading, the inside address, salutation, the subject heading, the body of the letter, the complimentary close, the senders signature and identification, the designation, etc. The purpose of having the heading is to enable the receiver to identify at one glance information concerning the sender and to facilitate replying, some letter headings also include a reference number