You have a special card which operates the electronic lock on your room door and a key for the main door of the door of the hotel. These are your responsibility and should never be lent to anyone, including your fellow classmates. If you lose them you will be charged PS20 per replacement. Do not leave your room unlocked even for short periods. Unfortunately, theft from student hotels is very common and insurance companies will not pay for stolen goods unless you can prove that your room was broken into by force.  _  There are rarely any rooms available for visitors, except at the end of the summer term. Stan Jenkins, the hotel manager, will be able to tell you and can handle the booking. A small charge is made. Stan also keeps a list of local guesthouses, with some information about what they're like, price, etc. You are also allowed to use empty beds for up to three nights, with the owner's permission (for example, if the person who shares your room is away for the weekend ), but you must inform Stan before your guest arrives, so that he has an exact record of who's in the building of a fire breaks out. Students are not allowed to charge each other for this.  _  There is a kitchen on each floor where light meals, drinks, etc. maybe prepared. Each has a large fridge and a food cupboard. All food should be stored, clearly marked with the owner's name, in one of these two places. Bedrooms are too warm for food to be stored, and the cleaners have instructions to remove any food found in them. After using the kitchen, please be sure you do all your washing up immediately and leave it tidy. If you use it late in the evening, please also take care that you do so quietly in order to avoid disturbing people in nearby bedrooms. If a friend visits you for the weekend, he or she can  _  . A) stay at a local guesthouse B) book an empty house for free C) use an empty bed without permission D) share your room by paying your roommate
A

Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly , for example by dipping it in water , it will be very hard but also very brittle ---that is , It will break easily. Metal that has been annealed is soft but does not break as easily . It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly , for a certain length of time. The longer the heated metal takes to cool slowly , the softer it becomes . Annealing can also be used on other materials, such as glass. Annealing can make metal   _  . A) hard and tough B) hard but brittle C) soft but tough D) soft and brittle
C

Mayor Boris Johnson Monday outlined plans to make London "the cleanest, greenest city on Earth" by the 2012 Olympics and called for commitments from other world cities at a climate change conference, leaders of the world' s 40 largest cities are meeting in Seoul this week for a summit on combating global warming -- the third to be held since 2005.     "What we should do in Seoul is agree that we will stop the endless addiction of mankind to the internal combustion engine  ," said Johnson. He said at a press conference the world's cities consume 75 percent of the world's energy and produce 80 percent of the emissions which cause climate change. "The problem of our planet is an urban problem," Johnson said.     He said the British capital wants to use the Olympics "to drive the greening and the improvement of our city" and noted that London is committed to reduce carbon dioxide emissions by 60 percent by 2025.     Johnson said the key measure was being taken to solve problems relating to housing and commercial buildings, which accounted for 70 percent of carbon dioxide emissions in London. This involved retrofitting  -- installing lagging -- in large numbers of public buildings.     Johnson proclaimed himself a "passionate cyclist" and said he would push ahead with cycle superhighways around London.     London's air quality problem, he said, was caused by vehicle emissions from 8,300 worn and used diesel  buses, which could be replaced by low-carbon vehicles. In addition, there were also 32,000 taxis running on diesel fuel, which could be replaced by electric vehicles.     Johnson said there would be a few programs in the next few years to produce a "cleaner, greener" bus for the city. "The age of the diesel bus has got to be over in London." Which of the following statements is NOT TRUE according to this passage? A) London's air quality will be improved in the near future. B) The used buses running on diesel will be replaced by electric vehicles. C) London promises to reduce carbon dioxide emissions by 60 pendent by 2025. D) Something has been done to solve the problem of carbon dioxide emissions.

B