1 . Some of the most famous scientific discoveries happened by accident. From the microwave oven to penicillin, scientists trying to solve a problem have sometimes found unexpected things. This is exactly how we created phosphorene nanoribbons (磷烯纳米带) — a material made from one of the universe’s basic building blocks, which has the potential to revolutionize a wide range of technologies.

We'd been trying to separate layers of phosphorus crystals (晶体) into two-dimensional sheets. Instead, our technique created tiny ribbons one single atom thick and only 100 or so atoms across, but up to 100,000 atoms long. We spent three years improving the production process, before announcing our findings. The two-dimensional ribbons have a number of remarkable properties (属性). Their unbelievable width allows their properties, such as whether and how they conduct electricity, to be controllable. They are also very flexible, which means that they can follow any surfaces they’re put on perfectly, and can even be twisted.

More than 100 scientific papers predicted the transformative potential of these ribbons, should it be possible to create them, across a range of technologies — some as many as five years before the publishing of our discovery in Nature. Perhaps the most important of these is in the area of battery technology. The structure of phosphorene nanoribbons means that the charged ions (带电离子) that power batteries could soon move up to 1000 times faster than they currently possible do. This would mean a significant decrease in charging time, alongside an increase in capacity of approximately 50%. Such performance gains would provide massive boosts to the electric car and aircraft industries, and allow us to use renewable energy more readily, even on grey, calm days.

1. What does “we” in the text refer to?

A．Scientists.	B．Doctors.
C．Publishers.	D．Technicians.

2. What can we know about phosphorene nanoribbons in Paragraph 2?

A．Its shape.	B．Its origin.
C．Its structure.	D．Its characteristic.

3. What would reduce charging time according to the scientific papers?

A．The cleaner source of energy.

B．The bigger batteries of tiny ribbons.

C．The increasing capacity of batteries.

D．The faster moving speed of charged ions.

4. What does the text mainly introduce to us?

A．The amazing development of battery technology.

B．Significant changes brought by wonderful discoveries.

C．A “Wonder material” created accidentally by scientists.

D．Unexpected inventions made in human’s history.