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Read and choose the best answer to complete the dialogue. W: Our car has taken us right to the foot of the Great Wall, Mr. Smith.M: Oh, what a marvelous sight it is! Could you tell me _________________?W: It runs all the way across the eastern half of China. It’s 6,700 kilometers long.M: 6,700 kilometers! No wonder you call it in Chinese Wan Li Chang Chen. W: Yeah, the Great Wall is the only man-made building that could be seen from the moon.M: Really? I never heard of it before.