注意：行文连贯，涵盖要点，适当发挥。词数100左右。
                                                                                                BETTER BODY GYM
                   Special offer! One month free membership! Join us this week and receive:
                   ● a free T-shirt       ●  free personal training hours       ●  1 month free membership
                   Build the body you've  always wanted ! Get fit! Get healthy!
                   35 classes every week, including tennis and swimming.
                   Two branches in the city ——one downtown and one by the freeway!
                   Open from 10:00a.m. to midnight, 365 days a year.
                   Call 5555-4567 for more information. We're here to help you!
 Dear Li Hua,
            You've been looking for a gym to build your body, haven't you? I'm glad to tell you that I've just read an ad about such a gym and recommend it to you.

Best wishes

Wang Lin

影响河流流向的因素是（　　）

选出不同类的单词。