A:impressio
B:comment
C:reactio
D:opinio
The little boy is healthy, _____ he is happy, too.
如图反映的历史现象,出现在( )
The talented boy finished his performance p____ at the concert.
食盐是重要的调味品,精盐是由粗盐提纯而来,在提纯过程中通常不需要的操作是