17．
根据短文内容及首字母提示，填写所缺单词，并将答案填写在答题卡标号为72-81的相应位置上．
Did you know that you can help the environment if you buy recyclable products instead of non-recyclable ones？Look for the recycle （72）symbol-three arrows that make a circle-on the package．Recyclable products are usually made out of things that already have been （73）used．It usually takes less energy to make recycled products than to make new ones．The more energy we save，the （74）better．
Imagine that it's a hot summer day．You put an ice cream on the sidewalk，and it melts．（75）Why does this happen？Well，you probably know that the sun causes the ice cream to melt．But you may not know that the sun produces solar energy．Solar energy is （76）another way of saying"energy that comes from the sun．"Solar energy can be used to heat homes，buildings，water，（77）and to make electricity．Today，more than 200，000houses in the United States make use of the （78）solar energy．
Cars are an important part of life for most people．But cars also cause pollution and give out a lot of greenhouse gases into the air．（79）Luckily，there are some cars that are better for the environment．These cars can travel longer on a smaller amount of gasoline．They don't （80）pollute as much，either．Using these kinds of cars can help reduce the amount of greenhouse gases in the air．
Many things，（81）like computers，TVs，stereos，and VCRs，have special labels on them．The label says"Energy"and has a picture of a star．Products with the ENERGY STAR
? label are made to save energy．Buying products with ENERGY STAR
? labels will help protect the environment．
