A:3;
B:23;
C:33;
D:43.
如图,是由若干个相同的小立方体搭成的几何体体俯视图和左视图.则小立方体的个数可能是( )
My mother called and asked me if I had _______ the birthday gift from her.
科学家把人胰岛素基因导入大肠杆菌,得到了能生产人胰岛素的“工程菌”,这种方法属于( )