18. The chemical ____ from cars and factories make the air, water and soil dangerously dirty.
A. pollution B. polluted C. pollutants D. pollute
III. Read the following passage and do the tasks that follow:
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 units on the roofs of buildings collect the energy and use it to heat
water. 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.
* Answer the questions:
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