高一英語下冊Unit4單元復習教案
there are still some problems with solar power，though. solar cells work only on sunny days. at night or in cloudy weather，people need another power source. solar panels also cause space problems. they are very large. many large solar panels are needed to make lots of electricity. it would be hard to find space for them all.
solar energy is expensive. solar panels cost a lot to build. so solar energy costs twice as much as power from fossil fuels.
solar cells are not that efficient yet either. they do not use all the sunlight that hits them. only 20 percent of the light can be turned into power. the rest of the energy is wasted. people need to invent more efficient cells that do not waste so much sunlight. then the cost of solar energy will fall.
solar power is cheaper than fossil fuels in some ways，though. air pollution from fossil fuels causes expensive damage. people get sick from breathing dirty air. gases from burning oil also hurt plants，animals，and buildings. solar power would save us billions of dollars in these “hidden” costs.
【解題導語】 太陽能是世界上最強大的能源，它環保、取之不盡，本文主要介紹了有關太陽能的收集問題。
5. people make electricity from solar energy because ________.
a. the sun is hot enough
b. the sunshine changes into energy itself
c. solar panels make it
d. special houses are built for electricity
解析：選c。細節理解題。根據文章第二段的內容可知。難度適中。
6. the advantages of solar energy are as follows except the fact that ________.
a. it causes no pollution
b. it can be used endlessly
c. it can be used at anytime
d. it won’t cause greenhouse effect
解析：選c。細節理解題。根據文章的第五段的第二句話可知c項不正確，所以本題選c。本題易。
7. which statement is right for solar energy?
a. it can be collected on all weather conditions.
b. sunshine panels are not expensive to build.
c. only more than one third can be used.
d. it is not easy to collect.
解析：選d。推理判斷題。根據文章第二段中的最后一句話可以推知。難度適中。
8. the underlined word in the last paragraph probably means______.
a. can not be calculated
b. can escape quickly if not protected
c. solar energy will be used up one day
d. people don’t understand and pay for the damage caused by burning fuels
解析：選d。推理判斷題。根據文章的最后一段的第二、三、四句話可以推知。難度適中。