题目

下列有关有机物HO-CH=CH-COOH性质的描述：①能发生加成反应；②能发生置换反应；③能发生取代反应；④能发生氧化反应；⑤能发生水解反应；其中正确的是A. ②③④⑤ B. ①②③④C. ①②④⑤D. ①③④⑤  答案：B解析:略 ________ and short of breath，Andy and Ruby were the first to reach the top of Mount Tai.A．To be tiredB．TiredC．TiringD．Being tired