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.

7 . 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.

Beijing was once a city of bikes, the capital of a country    1    (know) as the Bicycle Kingdom, where cars were reserved for official and political business.    2    , decades of remarkable economic growth led to a huge flowing of cars in the city. Owning one became not just a marker of reaching the middle class but also a    3    (require) for marriage. As the economy boomed, autos pushed bikes off the roads,    4    (create) heavy pollution and miserable traffic.

Fortunately, now Beijing may be returning to its roots with a modern twist. Thanks to about 20 technology companies, brightly coloured shared bikes    5    (flood) Beijing since last year. Many local residents welcome the shared bikes    6    the flexibility and freedom they offer. They pick up the bikes and then ride and drop    7    off anywhere they like, locking the back wheel, with no need to find a fixed place.

Analysis in China say there are three factors    8    contribute to the sudden increase of bikes: a lot of cash looking for a home, a good idea and government support. “As the city’s population grew, traffic jams got    9    (bad).” Cai, the Ofo spokeswoman, said, “Shared bikes could solve the ‘last mile’ problem in    10    environmentally friendly way.”

9 . Sydney Trains is one of the most economical, reliable and convenient ways to travel throughout Sydney and its surrounds.

Our network, the NSW Trains Intercity, covers suburban Sydney and extends to the Hunter, Central Coast, Blue Mountains, Southern Highlands and South Coast regions.

The network is made up of several color-coded lines. Trains from different lines can share the same platform, so check display screen and listen to announcements.

Ticket prices are generally based on the distance traveled. You can visit transportnsw. Info for details.

Getting to the City.

In Sydney, if you’re near a train station, you’re on your way to the city. Every rail line leads directly or indirectly to the City Circle. It’s the loop around the central business district of Sydney. Most City stations are underground so look out for the sign on street level.

Automatic ticket gates

Large stations have automatic gates for entry to, and exit from, the station. If you have an Opal card or a ticket which has a magnetic stripe you must use the automatic gates. You may use the wide gate for wheelchair, pram or luggage access. Station staff will assist you.

Night Ride buses

Most trains do not operate between midnight and 4:00 a.m. For your convenience a special Night Ride bus service is available between these hours on most Sydney suburban lines.

Track work

In order for the tracks to the maintained, we sometimes have to replace train with buses, particularly at weekends, please check the track work section for the latest service alterations on your line.