祖母绿中Cr2O3含量越多，颜色越美丽，绿色越纯正。
参考答案：错
_________ close to the city centre, the modern six-star hotel is a landmark of our city.
A．Situated
B．Situate
C．Bing situated
D．To be situated
美俄曾多次威胁使用核武器
