阅读短文，从每小题的选项中选出最佳选项

    Driverless(无人驾驶的)technology is quickly progressing with many cars being tested on roads around the world．Now, researchers in Singapore are testing a self-driving scooter，which has four wheels and a seat．It can move at a speed of up to six kilometers an hour．Researchers said the scooter was built with materials that did not cost much money．

    The scooter was developed by the National University of Singapore．Researchers at the Massachusetts Institute of Technology(MIT)also took part in the project．It was designed(设计)for people who cannot，should not or do not want to drive a car．It could help older adults，the disabled or people who are too young to drive．

Marcelo Ang，a researcher at the National University of Singapore，says the scooter can be especially useful for people who use wireless devices(无线设备)while walking on city streets，because there is a sensors(探测器)in it． “I'm sure you have experienced people who almost run into you while using their phones on the street．Would it be so nice to drive the scooter without worrying about the safety?”he says．Besides，developers of the scooter say it can work together with ride—sharing services to make trips completely easy and safe．

The researchers hope the scooter will reduce the need for cars，which can lower pollution and reduce accidents．

    Marcelo Ang says the scooter has completed many successful tests at the university．Kevin Xiangyu Hui，a university student．tested the scooter and said he found the ride was very smooth and safe．“When I sat on this machine．I felt really relaxed and it was really cool．”The scooter has yet to complete lots of road tests so it is not available to buy at present．

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。

Going Green

Green is no longer just a color. It is a new way of thinking about the world and a way of living your life. It's catching on all over the world. More and more people decide to "go green" because they know that we only have one planet to live on. We won't be able to live on it much longer if we keep wasting energy, and destroying(破坏) our home with air, land, and water pollution.

"Green Living" means:

    Understanding that your choices affect(影响) not just you, but everybody everywhere.

    Understanding that your choices affect not just today, but the future.

Understanding that when we talk about "saving the planet" or "saving the environment," we are actually talking about saving ourselves!

You may be thinking: "Hey, I'm just one person, on a planet with billions. I can't really make a difference." Well, have you ever seen a group of people do "the wave(波浪)"? It always starts off with one or two people, jumping up and down like crazy. Soon thousands of people are joining in. "Going green" is just like that. It starts with small, simple actions. It can soon build into a wave that will change the whole planet and lead us all to healthier, happier lives.

    Many students have already shared with us their efforts to help the environment:

Gabrielle, 12, writes, "I have helped my community plant a garden and I ride my bike or skateboard to school."

Kaitlyn, 10, says, "Lots of paper towels are thrown away, so I use a reusable cloth towel to dry my hands instead."

"I always recycle(重复利用)" says Natalie, 13. "You can call me a recycler! I always look at the bottom of things. I want to see whether they have the little sign that tells you it can be recycled. So I almost recycle everything!"

Now it's your turn to think about how you can "go green". Make important choices and take actions to improve the environment right around you and the health of the whole world.

    People already know a lot about animals. However, there are still some things about animals that may surprise you. Here are some facts about animals you probably didn't know.

    Cows do have best friends and feel stressed when they are separated. Scientists have found that cows are very social animals and a cow always makes friends with other cows. When a cow is with its friends, it feels relaxed, compared with when it is alone.

    During breeding season, a male penguin(企鹅) will offer a small stone to a female penguin as a gift. If she takes it, they will become partners. When the female penguin lays an egg, she and her partner may carry it on their feet, because some penguins don't build nests(鸟巢).

    Crocodiles(鳄鱼) swallow(吞) stones. Crocodiles always swallow their food instead of eating it like other animals. They swallow stones which break the food into very small pieces in their stomachs. These stones may stay in their stomachs all their lives.

    Elephants use plants to treat pain or other illness. Scientists once found a pregnant (怀孕) elephant in Africa who ate a kind of plant which was not part of her normal food. Four days later, she gave birth to a baby elephant. The same plant was used by the local pregnant women.

    Robots are playing an important role in our life. They help us a lot.

    In factories, robots can help people do lots of work. They work faster and do not need a rest. People will feel bored if they do the same job again and again, but robots will not. And they can work in same dangerous places. Usually people cannot.

    In our homes, robots are useful, too. They can help us do some cooking. They can help blind people read newspapers and help the old people move some heavy things. They are our best friends. They are clean and do not need to eat food.

    However, robots are not as clever as people. They cannot think like us. If we do not "'teach" them how to do things first, they can do nothing.

    Mobile phones are very popular with people. They are becoming smaller and more convenient.

    Now the scientists in Canada made a smart phone (智能手机)from electronic paper. The Paper Phone is flexible. People can control it by bending it or writing on it with a pen.

    Though the Paper Phone is only millimeters (毫米)thick, people can do many things with it. For example, people can use it to make phone calls, read books, watch movies and play music. So many people use it as a computer.

    The scientists think there will be no paper in the office. And people can store what they want in the Paper Phone.

    The scientists from Queen's University in Kingston, Canada said the Paper Phone would be in style in the future. It may be the end of paper and printers.

    To make people be interested in this kind of mobile phones, the scientists will make it more beautiful. People will see the Paper Phone on May 10 this year.