A、Requesting one’s business card directly. B、Accepting one’s card but not continuing contact with him. C、Putting one’s business

Requesting someone’s business card is a straightforward process. You need only say, "Do you have a business card?" or "May I have your business card?" When you want to present your own card, you can say, "Here’s my card. Please feel free to call me if you have any suggestions." If you wish to offer your card to a long-time associate, you can say, "Did I ever give you my card?" or "I mean to give you my card." It’ not polite to directly refuse a request from someone for your business card. Instead, you can say, "Sorry, but I’m afraid I’m all out at the moment." or "I neglected to bring them with me." Giving someone your card, of course, does not obligate you to continue contact, nor does accepting someone else’s card. When you do receive a card, say "Thank you." and examine it briefly before putting it away. You can use a business card that you received to refresh your memory about someone’s name and title before your next meeting. You can also record notes about the meeting on the back of the card, or place it in your card file.
Questions 16 to 18 are based on the passage you have just heard.
16. Which of the following is an impolite behavior according to the passage?
17. What should we do when accepting a business card?
18. What’s the function of a business card according to the passage?