题目

As the twentieth century came to a close ,the raw materials for a great national literature were at hand, waiting___________. A. to use           B. to be used        C.  to have used           D.  to be using 答案：B1mol某烃在氧气中充分燃烧，需要消耗氧气179.2 L（标准状况下）。它在光照的条件下与氯气反应能生成三种不同的一氯取代物。该烃的结构简式是 A               B  CH3CH2CH2CH2CH3 C               D  CH3－－CH2Cl