M: Well, this is it! What do you think of it?
W: I can hardly believe it's real．I've d        of seeing it ever since           _______
I saw it in books when I was a child．Just thinking of all this being built
by hand more than 2,000 years ago! No w      it's one of the         _______
wonders of the world．
M: A     the started building is more than 2,500 years ago when              ________
China was divided into v     states．Three of the northern states           ________
built defensive walls along their borders to keep o      the enemies．  ________
W．But I always thought the wall had been built by Qin Shihuang, the first
E      of China．                                                                           _______
M: Well, yes．In the way, you see, he united thew     country in the        ________
third century B．C．and one of the things he did was to join the s         ________
walls into one big wall and to build more walls from the east coast right
across the length of north China to the west．
W: It is certainly something any nation could be proud of．I hear this is the
only humanc      on the earth that can be seen from the moon．        ________
By the way, how tall is the wall?
M: The average h      is 7．8 meters; the average width is 6．5 meters   ________
at the base and 4．5 meters at the top．Would you like to go up to the top?
W: Yes! I'd like to have a look from the top．