69.what does the writer like doing in the summer and in the winter
XI. Read the passage and answer the following questions:
Scientists are now looking for cheaper way to use solar energy to heat air and water. Many buildings are using
solar energy to heat their water now. Solar unit on the roofs of buildings collect the energy and use it to heat
watwer. Although these units are still very expensive, more and more people are buying solar hot water heaters.
Universities and colleges give solar energy courses where students learn to build their own solar collectors.
They are also many books that explain the construction of solar collectors. In the future, there will be more and
more solar collectors, especially in the sunny desert areas of the world.
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