中药化学主要研究中药中化学成分的结构分类、理化性质、提取分离、结构鉴定、结构改造与修饰、构效关系及生物合成等内容。( )
查看答案
中药的化学结构与其生物活性不具有联系。( )
A. 对
B. 错
Someone ______ you are an easy-going woman. (say/ says)
My coach and boyfriend says ______ going to the U.S.A.next week. (they are/ he is)
The class ______ very excited when _____ heard the news. (was/ were; he/ they)
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