单项选择题

Questions 155-157 refer to the following letter.
May 8, 2007.
Ms. Laura Lorenzo
400 New Jersey Avenue, NW,
Washington, D.C. 20001
Membership Number: 10862
Dear Ms. Laura Lorenzo,
Welcome and thank you for joining the Flight Attendants Association of the Sky West Airlines(FAASWA). As a member, you will be eligible to vote in all elections. You will also receive all mailings and be able to access the Members Only Portion of our Web site at www.faswa.com.
Please retain a copy of this letter as you will need the membership number printed above to access our Web site.
Our Web site contains much valuable information, including advertisement for employment, an on-line membership directory, and information about our annual convention.
This year’s convention will be held October 12-14 in San Antonio, Texas. Please mark those dates on your calendar!
To notify us if your mailing address changes or if you lose your membership number, call the Membership Department at 202-737-5773. You can also update your information on our Web site.
Sincerely,


Doris Espinoza, Membership Manager
Why is the recipient told to keep a copy of this letter