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完形填空。阅读下面短文，掌握其大意，然后从各题所给的四个选项A、B、C和D中，选出最佳答案。 The three youths leaned over the metal rails along the sea-wall and watched a few fishermen pull in their nets. About thirty metres away, a boat pulled alongside the slippery steps leading 1 to the sea. “Hey, look!” exclaimed Rahim. “Those two men are2 heavy rocks. I thought we no longer do muscle labour in this technological 3 “They are 6 laborers who know how to spread the weight of the rocks they 7 . See how the man positions the rock just at the slope of his 8 . Some of the rock’s weight is set 9 his head, some on the right hand and some on the left hand. His body isn’t bent. His legs are well10 . ” “You’re right, Josh. He may have a small build. 11 he certainly well knows his job. Dear me! And to think we have been studying 12 ! ” Rahim thought about all that was happening. Suddenly, he said, “Technology won’t 13 the human being completely, it appears.” “I don’t think it will.” 14 Joshua. “You can harvest a crop of potatoes or wheat with one of those large, multi-purpose tractors, but you | 
