阅读下面的材料，然后根据材料内容回答所提问题。 You may have known several kinds of police, traffic police and street police. But have you ever heard of energysaving (节能) policemen? A group of 22 of these new policemen went to work last week in Beijing. They go around the city to see the use of energy in hotels, office buildings, shopping centers and other public places. One of their aims is to make sure that these places have set their air conditioning (空调) no co oler than 26℃. “If everyone sets their air conditioning at 26℃, Beijing will save 400 million kilowatt-hours of electricity in one summer,” said a TV advertisement. At the beginning of this month, China made its first action plan to fight pollution. It aims to reduce energy usage by 20% and increase renewable (可再生的) energy up to 10% from 7% by 2011. To introduce the public to a green life, last week Beijing held a show on energy-saving technology and products. “We want to tell people that there are certain ways to protect the environment. Each of us can find effective ways to do it in our daily life,” said Liu Qianguang, an environmental engineer in Beijing. 小题1:What do the energy-saving policemen usually do in Beijing? _________________________________________________________ 小题2:How much electricity will be saved in one summer if eve ryone in Beijing sets their air conditioning at 26℃? _________________________________________________________ 小题3: Has China planned to reduce energy usage by 20% by 2011? _________________________________________________________ 小题4:Why did Beijing hold a show on energy -saving technology and products? _________________________________________________________ 小题5:Who is Liu Qianguang? _________________________________________________________