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【单选题】
玛瑙的主要成份（ ）。A.
二氧化碳
B.
二氧化硅
C.
三氧化铝
D.
碳
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【单选题】Then the truth struck me / is confirmed by myself . He was blind.
A.
struck me
B.
is confirmed by myself
【简答题】Piracy is still a serious problem in China. Write a composition of about 400 words to state your view.
【简答题】words that is nice and warm. Still, your happiness makes 81. ____________
【简答题】How did men first learn to invent words? It is still unknown to people; in other words, the origin* of language is a mystery. All we suppose is that some early men invented certain sounds, in one way ...
【简答题】下列属于质量管理体系特性的是（ ）。
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