51.
How
is the text organized?
A. Explanation-Argument-Description.
B. Opinion-Discussion-Description.
C. Topic-Comparison-Supporting
examples.
D. Introduction-Supporting
examples-Discussion.
E
The
Great Wall of China can ,indeed, be seen from outer space with the naked(赤裸的) eye.
So
education officials, who felt worried about changing textbooks-which have long
held that the Great Wall and the dykes(堤堰)in the Netherlands were the
only man-made structures visible from space-can breathe easy.
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.