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问题
选择题
下列物质属于硅酸盐材料的是[ ]
A．碳纤维
B．石灰石
C．普通水泥
D．石英玻璃
答案
答案：
C
选择题
She had golden hair when she was a child, but _____ she got older and older, her hair went darker and darker.
A. while
B. when
C. after
D. as
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问答题 论述题
实行对外开放要处理好对外开放与独立自主、自力更生的关系
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