阅读理解：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项。 A letter of invitation is written to invite people for a business event or personal occasion. The letter should be short and clear. A soft and polite tone should be used. An invitation letter should have the date, time and the event. Always send the letter of invitation in advance. You need to let people know about at least a week before the event so that they can plan to come to the event. Let's take a look at some steps that will help you outline a letter of invitation: Begin the letter with name and address of sender and receiver. Note the date. Start the main body of the letter with salutations, a word like“Dear”followed by the receiver's name. Give the event in the first paragraph. Put relevant facts like date, time and place of the event in the beginning. Make that the receivers know the way to the place. Let the receivers know that they have to notice the inviters whether they will join the event or not before a certain date. The letter will note with the details of a contact person to confirm their attendance for the event. 1. What's the purpose of writing a letter of invitation? {A、B、C} A. To invite people for a business event. B. To invite people for a personal occasion. C. Either A or B. 2. Which is not necessary when writing a letter of invitation?{A、B、C} A. date B. weather C. place 3.The letter of invitation should not be {A、B、C}. A. short B. easy C. clear 4. Why should we send the letter of invitation in advance? {A、B、C} A. Because the invitation is important. B. Because the receiver will need to plan to come to the event. C. Because the receiver will forget to come to the event. 5.Which might be the title of the whole passage? {A、B、C} A. How to write a letter of invitation B. The importance of writing a invitation letter C The purpose of writing a invitation letter