阅读下面短文,从所给选项中选出能填入空白处的最佳选项,使短文通顺,结构完整,其中有一项是多余选项。
After playing a sport like football, players might go to the hospital for an X-ray if they hurt their legs or arms. Dentists also use X-rays to check teeth. At the airport, workers use X-ray machines to look inside bags. X-rays help people in many different ways. (1)
X-rays were first discovered by a German scientist, Wilhelm Conrad Röntgen. He found them quite by accident in 1895. One day, he discovered that an unknown kind of radiation could hardly pass through hard objects like bones. (2) It clearly showed her ring and her bones. That was the first X-ray photo in the world.
Why is there an “X” in the word “X-ray”? (3) He just knew that X-rays were new and useful for science. In fact, X-rays soon became an important tool in medicine. With the help of X-rays, doctors could see inside the human body for the first time.
Röntgen was awarded the first Nobel Prize in Physics in 1901 for his discovery. (4) And he never took out any patents on X-rays, so that the world could freely make use of his discovery.
(5) X-ray machines are better and safer than before. They help doctors find problems more easily. Thanks to Röntgen, people all over the world can benefit from X-rays.
A. Do you know who found it?
B. Then, he touched his wife’s head.
C. Later, he took a photo of his wife’s hand.
D. It’s because Röntgen couldn’t explain exactly how it worked.
E. But Röntgen gave away his Nobel Prize money to his university.
F. Today, X-ray technology is widely used in medicine and other fields.

A robotaxi is a kind of taxi without a driver. It is operated by robots, so it is called a robotaxi, driverless taxi or self-driving taxi. In recent years, with the development of technology, robotaxis have been operating in many big cities.
The advantages of robotaxis are obvious.
First, they can improve road safety. Human mistakes are a major cause of traffic accidents. Instead of a human driver, high-tech cameras and radar systems(雷达系统) on the taxi "see" the road, and follow traffic rules. For example, if a person suddenly crosses the street, the car can quickly slow down or stop on its own. This technology reduces the risk of accidents caused by human mistakes.
Second, they offer great convenience. Passengers can book a robotaxi through a mobile app anytime, anywhere. Wherever you go, you don't need to worry about parking problems. Besides, robotaxis can operate 24 hours a day without breaks. It is cheaper for passengers to take robotaxis than taxis with drivers.
However, the development of robotaxis also faces some challenges. One of the main problems is the high cost of technology. The other is legal(法律的) problems. For example, when an accident happens, it's not clear who should be responsible. Moreover, if robotaxis are widely used, many taxi drivers will lose jobs.
Although robotaxis still face many challenges, they are highly likely to change people's ways of travelling in the future. With the progress of technology and the improvement of laws, robotaxis may become a common sight on the roads in the near future, bringing us a more convenient and safe travel experience.
回答下面5个问题,每题答案不超过6个词。
1. Why is a driverless taxi called a "robotaxi"?

2. What will a robotaxi do if a man suddenly crosses the street?

3. How can people book a robotaxi?

4. Why are robotaxis cheaper for passengers to take than traditional taxis?

5. Who will suffer if robotaxis are widely used?