红细胞内的血红蛋白中所含的金属元素是[ ]
A．镁
B．钙
C．铁
D．铜
答案：C
I need a ________ bigger house so that I could share more room. [ ]
A. slightly
B. lightly
C. narrowly
D. hardly
A．状态
B．颜色
C．硬度
D．导电性
