关于鲫鱼的鳃丝数量和作用的叙述,正确的是( )
A:多个,与呼吸有关
B:多个,与摄食有关
C:单个,与呼吸有关
D:单个,与摄食有关
“Do you love me?” she asked. He h____ and then said, “I am not sure.”
了解中国的地形特点,最合适的地图是( )
Parents today also worry about their children's diets. Some doctors give the following advice: