中国人是从（）后开始真正了解马克思主义的。
参考答案：俄国十月革命
This is ______difficult problem that few students can work it out. [ ]
A. so
B. so a
C. such
D. such a
我国是一个统一的多民族国家，汉族人口最多，占全国人口为（）
A．94%
B．92%
C．88%
D．85%
