A:He has to kill the fatted calf.
B:He has feet of clay.
C:He must be the apple of his parents’ eye.
D:He must be the salt of the earth.
下列鸟类中,哪种鸟的雏鸟属于晚成鸟( )
下列实验中,①pH试纸的使用 ②过滤 ③蒸发 ④配制一定物质的量浓度溶液,均用到的仪器是( )