“平南三利”小刀因美观、耐用、锋利而驰名区内外，其制作材料“钢”属于[ ]

A．无机非金属材料

B．金属材料

C．复合材料

D．有机合成材料

Passage Two

What muscles should you use if you try to stand up with the heavy object

A．The waist muscles.

B．The leg muscles.

C．The back muscles.

D．The hip muscles.