Our life today depends very much on energy. In towns and in villages, on farms and in factories, machines have made life easier than it used to be. The machines use energy, and energy is needed for heating and lighting in daily life. Factories and industrial plants use a great deal of energy to make the things that we need.
Now let’s look at an interesting example with color. If you own a blue car, you know it is blue, even it is in bright sunlight, in darkness or under a yellow street light. Your eyes tell you that it changes color in these different situations, but your brain knows better. You have learnt that cars don’t change color, and your brain interprets (解释) the information your eyes give you.
这段文字所讲的是眼睛和大脑对于颜色的辨别。主题句为your brain interprets the information your eyes give you，前面有关蓝色汽车的例子是为说明这一观点服务的。
3. 逻辑连词处, 尤其是表示因果和转折的连词。常引出主题句的逻辑连词有：therefore, so, but, however, in short等。请看下面的例子：
The modern Olympic Games were founded with the intention of improving health and education, promoting world peace and encouraging fair and equal competition. But over the years, the Olympic saying, “Faster, higher, stronger”, has pushed scientists as well as athletes to do everything possible to reach new levels.
A. Business in the future
B. Health in the future
C. Education in the future
D. Transportation in the future
Life in the future
1. _____. Current trends show that transportation is becoming cleaner, faster and safer. Public transportation is already well developed in most downtown areas of China. New technology is being used to make sure that the cars, taxis, buses and trains we use don’t pollute the air.
2. _____. It will not be business as usual in the future. Companies and customers have already begun changing the way they do business. E-commerce, or business done on the Internet, is becoming more and more popular as people discover the advantages of online shopping. The Internet also makes it easier for companies to keep in touch with customers and companies in other countries.
3. _____. People now are paying more attention to the importance of a healthy diet and an active life. They are careful about what they eat and exercise regularly. So people in the future will be able to enjoy a longer and healthier life and remain active even in old age.
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