问题
选择题
为了避免青铜器生成铜绿，以下方法正确的是[ ]
A．将青铜器放在银质托盘上
B．将青铜器与直流电源的正极相连
C．将青铜器保存在潮湿的空气中
D．在青铜器的表面覆盖一层防渗的高分子膜
答案
答案：D
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为了避免青铜器生成铜绿，以下方法正确的是[ ]
A．将青铜器放在银质托盘上
B．将青铜器与直流电源的正极相连
C．将青铜器保存在潮湿的空气中
D．在青铜器的表面覆盖一层防渗的高分子膜
答案：D
You may have known several kinds of police --- traffic police, fire police and street police. But have you ever heard of energy-saving(节能) policeman? A group of 22 energy-saving 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 cooler than 26℃. They also set up a special phone line so that people can tell them which buildings fail to follow the rule. “If everyone sets their air conditioning at 26℃, Beijing will save 400 million kilowatthour of electricity in one summer. That’s one-third of all the usages of the city in the season,” said a TV advertisement. Other Chinese cities, like Wuhan in Hubei Province and Yangzhou in Jiansu Province, are going to follow Beijing’s steps in setting up a similar police team. As one of the fastest developing countries, China is using a lot of energy. This has a great effect on the country’s environment and limited(有限的) energy. From 1986 to 2005, the country experienced 20 warm winters continuously(连续). Numbers show that Chinese cities have to spend billions of yuan solving environmental problems every year. 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(可更新的) energy up to 10% from 7% by 2010. To introduce the public to a green life, last week Beijing held a show on energy-saving technology and productions. Environment-friendly machines, such as a vending machine that helps collect used bottles, have attracted lots of attention. “We want to tell people that there are certain ways to protect the environment. Each of us can find effective ways to do it on our daily lives,” said Liu Qianguang, an environmental engineer in Beijing. 小题1:The job of the energy-saving policemen is ______.
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