During World Space Week (October 4～10), you may learn about some of the space’s myths. One is: “The Great Wall of China is the only man­made object_______from space with the naked eye.”

You might be_______of this claim, but it’s not true. In fact, astronauts say that the Great Wall is just one of many man­made_______can be seen from space. From an orbit 217 kilometres_______the earth，it is_______to see highways，airports，bridges, dams and even large_______.

Cities can even be seen clearly from the International Space Station ( ISS, 国际空间站), _______circles about 400 kilometres above the planet. “You can see the_______pyramids from space with a pair of binoculars (双筒望远镜). They are a little difficult to_______with just your eyes,” said Ed Lu, a US astronaut________the ISS.

“With binoculars   you   can   also see   roads, harbours and even very large________in the ocean. From the moon, astronauts cannot________any man­made features on earth and the continents are very hard________. On Mars, the earth would appear to the naked eye as________but a bright ‘star’.”________what about the Great Wall? “You can see the Great Wall from space, ”Lu said. “But it’s a lot________than a lot of other objects. You can only see it in radar images, ________in ordinary photographs.”

No one knows who________the Great Wall story. The earliest reference to it comes in a book by a US writer Richard Halliburton, published in 1938. He wrote, “Astronomers say that the Great Wall is the only man­made thing on our planet visible to the human eye from the moon.”

Halliburton’s books________quite well during the first half of the 20th century. So, if he didn’t________the story himself, he certainly spread it widely.