题目

Jane was walking round the department store. She remembered how difficult  _61_  was to choose a suitable Christmas present for her father. She wished that he was as easy  _62_  _(please)as her mother,who was always delighted with perfume. Besides,shopping at this time of the year was not  _63_   pleasant experience: people stepped on your feet or _ _64_  _ (push)you with their elbows(肘部), hurrying ahead to get to a bargain. Jane paused in front of a counter  _65___ some attractive ties were on display. “They are real silk,”the assistant tried to 干洗衣服的干洗剂主要成分是四氯乙烯,对环境有害。家用不粘锅内侧涂覆物质的主要成分是聚四氟乙烯,对人体无害。下列关于四氯乙烯和聚四氟乙烯的叙述中正确的是 A.它们都属于高分子化合物 B.它们的分子中都不含氢原子 C.它们都能使酸性高锰酸钾溶液褪色 D.它们都可由乙烯只发生加成反应得到
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