下图中的物体是由( )个正方体组成的.
下列“课外实验”对应的结论错误的是( )
下列省区之间以黄河干流为天然界线的是( ) 。
— Dad, my kite is finished! Doing a DIY job is really fun.
— ! Just wait for a windy day and see how high it can fly.