阅读下列短文,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

    You know how much your telephone has changed over the past 10 years? Your car will change even more than that in the next 10 years.

    One of the biggest changes is that cars will drive themselves. Some day you may not need to drive a car. You will just tell the car where you want to go and it will drive itself.

    Google

    The American company Google has been working on a self-driving automobile for years. These cars are already on the roads in the United States, mainly in California.

    Google cars are truly self-driving. These cars have no steering wheels(方向盘) or pedals(刹车踏板).

    Last week, police ordered one of Google's cars to stop for driving too slowly on a public road. The car was not against any law, so no one was punished. But police did speak to the operators of the vehicle(车辆).

    According to Google, its self-driving cars have been driven nearly 2 million kilometers. That is equal to the distance the average person drives in 90 years.

    So far, no Google self-driving car has gotten a traffic ticket. Some of them have been in accidents when other cars hit them.

    Tesla

    Another American company, Tesla, added an “Autopilot(自动驾驶仪)” feature to its cars last month. Tesla put the feature, a computer software program, in cars that were built after September 2014.

    With the Autopilot turned on, the vehicle drives itself. The car will speed up, slow down, brake and steer by itself.

    You can take over driving any time by turning the steering wheel or touching a pedal. Your car will slow down if the vehicle in front of you gets closer. It will turn at bends and change lanes if you use the turn signal.

    Tesla Autopilot takes over driving at speeds over 29 kilometers per hour when you press a button twice. Autopilot is made for cross-country driving. It keeps you in the lane and helps you avoid hitting other cars.

    Other Self-Driving Cars and Buses

    Other companies such as Mercedes-Benz, Audi, BMW, Volvo and Toyota are working on self-driving cars. Another company called BestMile is also working on self-driving buses in Switzerland. The buses can hold up to nine people and will be tested for two years.

    There are many kinds of 1. transportation now. Which one do you like best, by train, by bus or by plane? Now let's look at these three kinds of transportation. 2.The fastest way to travel is by plane. If you want to save time, 3.乘火车是最好的选择. A plane ticket can also be easier to book, and there are 4.(hundred) of planes leaving half an hour to everywhere. But it is much 5.(expensive) than traveling by train or by car. Many people prefer to traveling together by train. Because the train is cheaper than the plane and you can see the beautiful scenery out of the windows. But sometimes people are very noisy on the train. And it's very small and crowded inside the train. Taking a car is great. You can feel freer in your own car and you can move quickly from place to place at any time you like. 6.But sometimes you may be late because of the heavy traffic  .You have to pay for a car park and petrol . Cars are less comfortable than trains. You can't sleep or relax when you drive. Cars pollute the air more than trains, too.

Why salmon will newer get lost

    When you're packing for an adventure, what's the most important thing you'll need? If you don't want to get lost, you' need a map. Or better yet, a GPS. What about other animals? How do they know where they're going?

    While humans depend on technology to travel, some animals have something far more advanced. Researchers, mainly from Oregon State University, US, found that Chinook salmon have a "built in GPS" of the Earth's magnetic field(磁场). This means as soon as they are born they are able to direct themselves in the ocean. It acts like a big map inside their brain.

    Scientists placed some baby salmon into a big swimming pool. To simulate the Earth's magnetic field, they put magnetic coils(线圈) all around the pool. Then, by changing the direction of the coils, the salmon began to change their own direction. They started to face in the direction of their ocean feeding area. This is a safe place in the ocean where salmon can find food to eat. When the scientists changed the coils to the opposite side, the salmon also turned in the opposite direction. Just by using their "built-in GPS", the salmon were able to figure out the direction of their feeding area.

    How did Chinook salmon get their "built in GPS"? The scientists believe that their navigation(导航) skills came through evolution(进化). The fish that were able to reach the feeding area lived longer. Then they could pass on their navigation skills to their babies. So if you're ever lost and in need of some help, maybe you should ask a salmon to point you in the right direction!

    Have you noticed your life becoming a little easier? Now, when you go to a certain shopping mall, you can enjoy its free Wi-Fi there. When you want to take a taxi, you can book one with your phone. In fact, all these can be seen as the basic parts of a smart city.

    The idea of a smart city was brought up by US company IBM in 2010. Generally, a smart city is a city that uses digital technologies such as the Internet to improve city planning, save money and resources, and make our life convenient. How smart can a city be? Here are great examples that we can learn from.

    In 2009, Dubuque became the first smart city in the US. The city used smart water meters to take the place of traditional water me tens. They can detect (探测) water waste and leakage (泄漏) and send data to let the house owner know. The same system is used for other city resources like electricity and natural gas. In this way, people know how they use their resources and are glad to help reduce waste.

    Santander in Spain also gives us a look at the future. If people point a phone toward a nearby bus stop, the phone immediately shows all bus lines that serve the stop as well as their arrival times. The government organized a research team and provided an App (应用程序) that collects data on almost everything: light, temperature, and the movements of cars and people. Opening the App near a supermarket provides immediate information on special offers.