细小玻璃碎片进入眼内，该异物属于：()
A．不透性异物
B．半透性异物
C．透过性异物
D．金属性异物
E．磁性异物
参考答案：B
The boys and girls were happily making a snowman, _______ with cold.[ ]
A. their faces red
B. their faces were red
C. their faces turned red.
D. their faces to be red
水的物理性质中，“物质单位体积的质量”属于（）
A.密度
B.比重
C.表面张力
D.黏性抵抗
E.水的对流特性
