题目

第二节 完形填空（共20小题，每小题1.5分，满分30分）      Sudha Chandran, a classical dancer from India, was cut off in the prime of her career--quite literally --when her right leg had to be removed after a car 36____      Though it brought her bright career to a stop,she didn't 37____      In the painful months that 38_____,she met a doctor who developed an artificial leg (假肢）made from rubber 39____with sponge (海绵）。      So 40____was her desire that she decided to go back to  41____after she had been fitted with an artificial leg .      S为实现中国2000年消除碘缺乏病的目标，卫生部规定食盐必须加碘，其中的碘以碘酸钾( KIO3)形式存在.已知在溶液中IO-3可和I-发生反应：IO-3+5I-+6H+=3I2+3H2O，根据此反应，可用试纸和一些生活中常见的物质进行实验，证明在食盐中存在IO-3.可供选用的物质有：①自来水、②蓝色石蕊试纸、③碘化钾淀粉试纸、④淀粉、⑤ 食糖、⑥食醋、⑦白酒.进行上述实验时必须使用的物质是(   ) A.①③      B.③⑥      C.②④⑥     D.①②④⑤⑦