The following sentence includes an example. Find out the example signal. (每句只有一个example signal) (例如: More and more people are leading sedentary life styles due to work conditions. Take, for example, office workers in the UK who spend at least 8 hours a day, 5 days a week sitting in front of their computers. 则本句中的 example signal 即为 for example ). 4. Raising fuel prices is the best option because it would lower demand. This is because the laws of economics dictate that the higher the price of a commodity, the lower the consumption of that product and this will lead to less people using vehicles. For instance, when the price of fuel skyrocketed during the oil crisis in the 1970s, there was a huge reduction in the amount of cars on the road.