One afternoon in January 1989, Susan Sharp, 43, and her 8-year-old son, David, were walking hard【C1】______an icy parking lot,【C2

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问题    One afternoon in January 1989, Susan Sharp, 43, and her 8-year-old son, David, were walking hard【C1】______an icy parking lot,【C2】______Susan’s cane slid on the ice. She【C3】______face first into the mud. David【C4】______to his mother’s side.
   "Are you all right, Mom?"
【C5】______, Susan pulled herself up. "I’m okay, honey, "she said.
   It had been nearly two years since Susan had trouble walking. She was falling more【C6】______now. Every inch of ice was a【C7】______danger for her.  "I wish I could do【C8】______," the boy thought.                                                ’
   David, too, was having【C9】______of his own. The boy had a speech defect. At school he【C10】______asked questions or read aloud.
   One day David’s teacher announced a【C11】______assignment. "Each of you is going to come up with an invention," she said.  This was for" INVENT AMERICA!", a national competition to encourage creativity in【C12】______
   An idea hit David one evening.【C13】______only his mother’s cane didn’t slip on the ice, he thought. "That’s it ! "David realized.
   "What if I fixed your cane so a nail stretched out of the bottom?" he asked his mother.
   "【C14】______the sharp end would scratch floors," Susan said.
   "No, Mom. I could make it like a hall-point pen. You take your hand【C15】______the button and the nail returns back up. "Hours later the cane was finished. David and his father, Jeff,【C16】______as Susan used it to walk 50 feet across the【C17】______"It works!" she said.
   In July 1989, David was declared national winner at the annual "INVENT AMERICA!" ceremony in Washington D. C.
   As David began to make【C18】______appearances, he was forced to communicate more closely. Today, David is nearly【C19】______of his speech defect, and his cane is waiting to be widely used.【C20】______the boy who once people had trouble talking now hopes to start making canes for people who have trouble walking.
【C19】

选项 A、short
B、full
C、free
D、afraid

答案C

解析 根据上文,David经常在公开场合露面与人交流,肯定已克服了语言缺陷,即不再受其干扰,故选be free of。
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