题目

1mol某烃在氧气中充分燃烧，需要消耗氧气179.2L(标准状况下)。它在光照的条件下与氯气反应能生成3种不同的一氯取代物。该烃的结构简式是（ ） A . B . CH3CH2CH2CH2CH3 C . D . 答案：B_____ all London taxis were black, but now you sometimes see other colours. 　　  A. At one time   B. At a time   C. From time to time  D. At the same time