A:鲫鱼体表被覆鳞片,用鳍游泳
B:蚯蚓身体分节,用肺和皮肤呼吸
C:家兔牙齿分化,盲肠特别发达
D:“金蝉脱壳”中“壳”指外骨骼
递给别人东西时,你会说:()
When the room_____by electricity, we can see the_____ candles on students’ desks sending off heavy smoke.( )
产生卵细胞、形成受精卵、胚胎发育、胎儿和母体物质交换的场所分别是( )