A:大鲵
B:中华鲟
C:扬子鳄
D:白鳍豚
下面是尿的形成过程示意图,据图回答问题:
历史上遗留下来的许多实物是重要的史料。如图器物可以佐证的是( )
If you do some more reading, listening and speaking, you can the number of words and your listening and understanding ability.