【名词&注释】
无机物(inorganic matter)、碳原子数(carbon number)、案发现场、有机物命名(nomenclature of organic compound)
[多选题]警察常从案发现场的人体气味来获取有用线索，人体气味的成分中含有以下化合物：①辛酸；②壬酸；③环十二醇；④5，9一十一烷酸内酯；⑤十八烷⑥己醛；⑦庚醛。下列说法正确的是
A. ①、②、⑥分子中碳原子数小于10，③、④、⑤分子中碳原子数大于10
B. ①、②是无机物，③、⑤、⑦是有机物
C. ①、②是酸性化合物，③、⑤不是酸性化合物
D. ②、③、④含氧元素，⑤、⑥、⑦不含氧元素
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举一反三：
[单选题]Why was David able to get the job in the company?
A. He had done well in all his exams.
B. He had written some computer programs.
C. He was good at playing computer games.
D. He had learnt to use computers at schoo1.
[单选题]Where are the two speakers?
A. In Atlanta
B. In Chicago
C. In New York
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