问题
选择题
对“鱼鳍在游泳中的作用”进行探究时，发现能够保持鲫鱼身体平衡的是[ ]
A．胸鳍和腹鳍
B．背鳍和尾鳍
C．背鳍和臀鳍
D．胸鳍和尾鳍
答案
答案：A
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对“鱼鳍在游泳中的作用”进行探究时，发现能够保持鲫鱼身体平衡的是[ ]
A．胸鳍和腹鳍
B．背鳍和尾鳍
C．背鳍和臀鳍
D．胸鳍和尾鳍
答案：A
| 完形填空。 | |||
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