The global energy crisis is approaching. What can we do? Here are some steps you can take。
Cooling puts the greatest stress on your summer energy bill and the power grid(電網(wǎng)). Just as a tuneup for your car can improve your gas mileage, a yearly tuneup of your heating and cooling system can improve efficiency and fort. Clean or replaces filters monthly or as needed。
Drive the car that gets better gas mileage whenever possible if you own more than one vehicle. If you drive 12,500 miles a year, switching 10 percent of your trips from a car that gets 20 miles per gallon to one that gets 30 mpg will save you more than £65 per year。
Carpool. The average . muter(乘車(chē)上班族) could save about £260 a year by sharing cars twice a week with two people in a car that gets mpgassuming the three passengers share the cost of gas. (2008安徽卷)
This passage is mainly about ________。
A. energysaving tips B. fuelsaving tips
C. doityourself tips D. environmentprotecting tips
Domestic (馴養(yǎng)的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses werent tame (馴服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today。
Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication。
The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world. (2008北京卷)
The passage is mainly about _______。
A. why humans domesticated horses
B. how humans and horses needed each other
C. why horses came in different shapes and sizes
D. how human societies and horses influenced each other