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

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问题    One afternoon in January 1989, Suzan Sharp, 43, and her 8-year-old son, David, were walking hard【C1】______an icy parking lot(停车场),【C2】______Suzan’s cane(手杖)slid on the ice. She【C3】______face-first into the mud. David【C4】______to his mother’s side. "Are you all right, Mom?"【C5】______, Suzan pulled herself up. "I’m okay, honey, " she said.
   It had been nearly two years since Suzan 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(缺陷). 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 to a nail stretched out of the bottom?" he asked his mother.
   "【C14】______the sharp end would scratch floors, " Suzan said.
   "No, Mom. I could make it like a ball-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 Suzan 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 clearly. To- day, David is nearly【C19】______of his speech defect, and his cane is waiting to be widely used.
【C20】______the boy who once had trouble talking now hopes to start making canes for people who have trouble walking.
【C18】

选项 A、easy
B、better
C、private
D、public

答案D

解析 make public appearances表示“公开露面”。前文告诉大家1989年David成为“INVENT AMERICA!”的获胜者,所以此处选D。
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