补全对话-5选5 0.65 引用1 组卷43
A: Hello, Mother! We learned about light in physics classes. It travels very fast.
B:【小题1】
A: Oh. It travels at a speed of 300, 000 kilometers a second.【小题2】 Light from the sun reaches us in less than 9 minutes.
B:【小题3】
A: No, it isn’t. Light from the nearest star except the sun needs about 4 years to reach the earth.
B: Wow!【小题4】
A: Mmm...It takes hundreds of years for light from the farthest star to reach the earth.
B: Oh, how clever you are! I think you can be an astronomer (天文学家) when you grow up.
A: Thank you, Mother!【小题5】
B:
A: Oh. It travels at a speed of 300, 000 kilometers a second.
B:
A: No, it isn’t. Light from the nearest star except the sun needs about 4 years to reach the earth.
B: Wow!
A: Mmm...It takes hundreds of years for light from the farthest star to reach the earth.
B: Oh, how clever you are! I think you can be an astronomer (天文学家) when you grow up.
A: Thank you, Mother!
| A．Do you know how fast it travels? |
| B．Is the sun farther than the other stars? |
| C．I will try my best. |
| D．How long does it take for light to reach the farthest star? |
| E．The sun is about 149, 840,000 kilometers away from the earth. |
22-23九年级上·全国·课后作业
