阅读理解。 1 Dear guest, We want to do our best to help with the environmental protection, but we do provide washing things (toothbrush, toothpaste, bath shampoo, etc.) If you forget to bring any of these with you, just dial 9 and call the guestroom department. If you wish, we shall send you what you need for free. 2 Dear guest, The hotel wishes to save the world's natural resources (资源). Every day, tons of detergent (洗涤剂) and millions of tons of water are used to wash towels (毛巾) which have been used only once. Here's how you can help: ﹡A towel on the rack (架子)means: 'I'll use it again.' ﹡A towel on the floor means:'Please change.' 3 Dear guest, Your bedclothes are changed every day. If you'd like to help save the world's resources, just leave this card in the morning. Your bed will be made up as usual but the sheets will not be changed. In this way, we can both help protect our environment. 1. The three cards can most likely be found in a . [     ] A. hotel B. supermarket C. bookshop D. bank 2. A guest who forgets to bring a toothbrush with him . [     ] A. must buy one from the hotel B. should get one ready by himself C. can get one from the hotel for free D. may ask someone to buy one for him 3. If guests want to get their towels changed, they should leave them . [     ] A. in the rack B. on the floor C. under the bed D. in the desk 4. The third card tells guests . [     ] A. how to get the towel changed B. where to get the towels changed C. where to get the bedclothes changed D. how to get the bedclothes changed 5.The aim of the article is to . [     ] A. follow the rules of the hotel B. get a good service C. protect our environment D. All of above