体内铁主要存在于()
A.骨骼
B.甲状腺
C.肝和脑
D.肌肉
E.血红蛋白
参考答案:E
The girl who is studying at the art college has a _____ for music and dance. [ ]
A. gift
B. present
C. power
D. strength
地壳中含量最多的金属与含量最多的非金属形成的化合物是[ ]
A.Fe2O3
B.Al2O3
C.SiO2
D.NO2