出自《寡人之于国也》的两个成语是____、____。
下列说法中错误的是
A. white B. orange C. pencil D. pen E. green
Hi, I'm Lucy. I have a pencil box. It's ____ I have a ____ It's black. I have an eraser. It's ____ I have a ____ It's red. I have a crayon. It's____
72-18=____
60-24=____
87-35=____
64+36=____
在土壤侵出液中培养的玉米幼苗长势比蒸馏水中的好,合理的解释是土壤浸出液中含有玉米生长所需要的( )