Some scientists were working in a spaceship in outer space. They looked out of the1of the spaceship. They could2the planet Earth. It looked like a blue and white3. Scientists4very powerful cameras. They took many5of our planet from outer space. The photos were very6. The scientists were surprised at7they saw.

In the photos, they saw land, blue sea and8clouds. Some scientists said they could see a9, dark line on the yellow earth. They thought it10the Great Wall of China! Do you think so?