What has many rings but is not a shopping mall? It is Saturn (土星). Its rings look really beautiful! But unluckily, they will disappear within 300 million years because of “ring rain”. Saturn’s rings are made of ice and rocks. The gravity (重力) pulls these things and makes them fall down to the planet. About 600,000kg of these things fall every minute! They could fill an Olympic-sized swimming pool in half an hour. Scientists don’t have an answer how the rings came out. Some think that large comets (彗星) hit Saturn’s moons. The moons then broke up into pieces and became the rings. Others think the rings are just part of Saturn. Saturn has seven main rings. They are different in size and width. E ring is the farthest from Saturn. It is the largest planet ring in our solar system(太阳系).
【小题1】How many main rings does Saturn have?
【小题2】What makes the rings fall down?
| A．The gravity. | B．Large comets. | C．The moons. | D．The solar system. |
【小题3】Are Saturn’s rings the same in size and width or different?
| A．No, they aren’t. | B．Yes, they are. | C．The same. | D．Different. |
【小题4】What does the underlined word “disappear” mean?
