A warning system     1     (prevent) drivers from falling asleep was introduced at the 2020 China International Fair for Trade in Services, which was held from September 4 to 9 in Beijing. The system can judge     2     the driver is sleepy by monitoring how long the driver’s eyes close. If the driver is tired, the system will sound an alarm     3     the driver’s eyes reopen. In the future, other dangerous driving     4     (behave), such as not wearing a seat belt and making phone calls while driving, might also be added into this warning system.

In the early 1800s, Stanislas Baudry built public baths in the center of a town in France. To encourage people to come, Baudry drove a large vehicle around to give people a ride to the baths. He called the vehicle “an omnibus”,     1     is a Latin word meaning “for everyone”. Then he     2     (learn) that many passengers would get off at stops during the journey to the baths. So Baudry shifted the focus of his omnibus service. He created     3     permanent (永久的) route for passengers to board and get off. Eventually, the omnibus became known     4     (simple) as a bus.

A warning system to prevent people from falling asleep while driving     1     ( introduce) at the China International Fair for Trade in Services. It can judge whether the driver is sleepy     2     monitoring how long the driver’s eyes close or if his or her head drops.     3     the driver enters a state of tiredness, the system will immediately sound an alarm until the driver’s eyes reopen.

In most big cities, it is easier to hire a taxi at a moment’s notice when the weather is good. But when it’s raining, people have a much harder time     1    (find) one. One obvious reason is that many people who walk short distances during good weather prefer to take a taxi in the rain.     2    , taxis tend to be more fully occupied on rainy days. Besides, the supply of available taxis is also smaller because taxi drivers can     3     (easy) reach the target fares and go home early.

10 . Electric Cars

Where do cars get their energy from? For most cars, the answer is petrol. But some cars use electricity. These cars have special motors that get their power from large batteries.

Most people tend to think of electric cars as a new invention, but they have been around for a long time. They were popular when the technology for petrol engines was not very advanced. Recently, electric cars have again become popular because people want cars that pollute less.

Electric cars are better than petrol cars in several ways. The biggest benefit is reduced pollution. In areas where there is a high percentage of electric cars, there is less pollution. But it is important to understand that electric cars still cause pollution. Remember that the electricity to power electric cars has to come from somewhere, which is most likely a power station. Unless these power stations run on solar or wind energy, they are most likely burning coal and oil to make electricity. The second benefit of electric cars is a reduction in the dependence on foreign oil.

There are several countries, including the United States, which don't want to rely on oil coming from other countries to power their transportation systems. They want the power to come from within their country, and since electric cars can run on electricity from coal or nuclear power stations, there is less of a need to import oil.

Despite the benefits of electric cars, there are some problems with them as well. One disadvantage is that electric cars are more expensive than petrol cars. This is mostly due to the high cost of the batteries these cars need. Electric cars run on batteries, just like a mobile phone does. But unlike a mobile phone, you cannot charge your electric car's battery by plugging it into a wall. They need to be charged in special places. Now, there is a lack of places where people can charge the batteries. Another problem is that electric cars cannot travel as far as petrol cars. Some people are afraid that the battery will run out of electricity (and the car will stop) before they reach their destination.

Despite these problems, many people, including automobile industry experts, believe that the percentage of electric cars will increase in the future.