Yang Liwei, the nation’s first spaceman, disappointed a lot of Chinese when he said he did not see the wall during his orbit of less than 24 hours in October 2003, giving rise to calls for revisions(修改) in textbooks.

　　But there is a rider: There are many, many structures which can also be seen, such as the Pyramids of Egypt, airports, highways and even Beijing’s Third Ring Road.

　　Undoubtedly, it requires an atmospheric “ perfect storm” in outer space, defined as an altitude of about 350 km and you have to be in the right place at the right time, under the right conditions to spot a particular structure. Chinese-American spaceman Leroy Chiao, who has been on three space flights and is currently coming to the end of his six-month stint(期限) on the joint US-Russian space station, has provided the first photographic evidence of sections of the Great Wall using commercially available equipment.

　　According to Chiao, the chances of shooting the Great Wall area are “maybe once every few days and only during daylight every three months. ” Since late March, Chiao has had just one opportunity to fly over the Great Wall, but the weather was dangerous. He has one last chance before he is scheduled to land in Kazakhstan on April 25—and he will be keeping a sharp lookout.

　　17. Now the education officials “can breathe easy” because they know_____.

　　A. they don’t need to change the textbooks

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