A:cover of which
B:which cover
C:of which the cover
D:all the above
我国四大工业基地分布图,下列各项中,不属于长江三角洲工业基地经济发展优势条件的是( )
All the students p____ at the lecture were deeply touched by his success story.
阅读《水之歌水之思》,回答问题。
文章用小标题有什么好处?