题目

设,则=__________. 答案：【答案】【解析】换元变换得到得到答案.设，则， ，即故答案为： AOUR PROMISEMaking your stay a complete success is our goal. Just let our manager on duty of front-desk staff know if any part of your stay isn’t satisfactory. We promise to make it right or you won’t pay for that part of your stay.FORGET SOMETHING?If you forget to pack any standard toiletry item(tooth brush, toothpaste, shaving cream, razor or comb), just call the front-desk and we’ll get you a free replacement right away.PLEASE REUSE THE TOWELSWe invite you to join us to save water by using your towels more than once.In addition to decreasing water and energy waste, you can help us reduce the amount of waste water that must be recycled within our community.Please hang the towels up if you wish to join in the program—if not, simply leave them on the floor.We appreciate your help!PLEASE CHANGE THE SHEETS TODAYThe Project Planet Program is in an effort of this hotel to protect the environment by saving water and decreasing waste water. If you are staying with us more than one night, as part of the Project Planet Program, we will wash your sheets every three days.If you would prefer not to join in this program, simply hang this card on the outside of your door and sheets will be changed right away. As always sheets are automatically changed after every guest checks out.We appreciate your help!1.We can find this passage in a ________ in a hotel.A．café barB．front-deskC．fitness centerD．guest room2.If you forget your comb, you can ________.A．buy one in the hotel shopB．replace one with a tooth brushC．phone the front-desk to get oneD．go in person and get one at the front desk3.Leaving the towels on the floor means that ________.A．you want to join in the programB．you want the room-maid to hang it upC．you need them collected and washedD．you want to use them more than once4.What is the Project Planes Program trying to do?A．Make your bed sheets cleaner.B．Work for a better environment.C．Help guests check out faster.D．Persuade guests to stay longer.