题干
It is true that knowledge _______ rather than being taught.
A：learns
B：learned
C：is learned
D：was learned
答案(点此获取答案解析）
C
It is true that knowledge _______ rather than being taught.
A：learns
B：learned
C：is learned
D：was learned
技术的不断进步，研究物质的手段和途径越来越多，N
、H3、O4、C60等已被发现。下列有关说法中，正确的是 （ ）