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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。 A very little boy was spending his Saturday morning playing in his sandbox. He had with him a plastic pail(桶) and a shiny, red plastic shovel(铲). In the31of creating roads and tunnels in the sand, be32a large rock in the middle of the sandbox. The boy dug around the rock,33to move it off the dirt. At first, he wanted to carry it out of the sandbox with his hands; however, it was too heavy. Later, with much34, he pushed the rock across the sandbox by35his hands. When the boy got the rock to the36of the sandbox, he found that he couldn’t roll it up and37the little wall.38, the little boy pushed, but every time he thought he had made some39, the rock tipped(翻滚) and then fell back into the sandbox. The little boy pushed and pushed, but his only40was to have the rock roll back. Finally he41tears. All this time the boy’s father watched from his living room window42the drama was unfolded. The moment the tears fell, a large43appeared across the sandbox. It was the boy’s father. Gently but44, he said,“Son, why didn’t you use all the strength that you had?” Defeated, the boy45back,“I did! I did！ I used all the strength that I had!” “No, you didn’t. You didn’t ask me for help.” The father46down, picked up the rock and dropped it off the sandbox. | 
