Great Wall of China
The construction of the Great Wall of China began over 9,000 years ago and initially 1 hundreds of miles of separated fortifications built by various rulers of China’s independent states. But around 220 B.C., Shi Huang Di became the first emperor of a united China and 2 various walls needed to be fortified and joined together. He ordered thousands of watchtowers to be built.
This was obviously an 3 required thousands of workers. Over 300,000 workmen and criminals were dragged off to build the wall, 4 died from malnutrition, fighting, or 5 before even getting to the construction sites. It is rumored that some of the dead were 6 the foundations of the wall to ward off evil spirits.
For the surviving 7 the biggest problem was the ever-changing terrain as they traveled west. There wasn’t always rock available, so they used 8 until it was hard. In other places the hills were so steep that oxen couldn’t pull the carts of rock up to the building site, so the men themselves carried the rocks on their backs. In the desert, the wall was built using sand, pebbles and grass. 
But why go to all the trouble? The obvious answer is protection, 10 at the time construction first began, China 11 powerful enemies. It seems, however, that the wall may have been much more 12 the Chinese people in than at keeping enemies out. 13.
When the Manchus took control of China in 1644, the wall ceased to have military significance.  The empire now extended well north of the wall, and China’s new enemies were to come from a different direction – across the sea. Today, although the wall no longer plays any role in China’s defense system, it has become a symbol of the 15
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Which of the following alternatives to the underlined portion would NOT be acceptable?CorrectIncorrect
Given that all the choices are true, which one most effectively emphasizes the grueling nature of the labor the workers were forced to endure?CorrectIncorrect
What would be the most effective change to make in the underlined sentence?CorrectIncorrect
Given that all the choices are true, which one most effectively signals the shift in focus that occurs at the beginning of this paragraph?CorrectIncorrect