DNA分子解旋发生在[ ]
A．转录和复制
B．转录和翻译
C．转录和逆转录
D．逆转录和翻译
答案：A
________work has been done to improve the people's living standard.[ ]
A. Many
B. A great many
C. A large number of
D. A great amount of
《公民道德建设实施纲要》要求：要把集体主义精神渗入社会生产和生活的各个层面，引导人们正确认识和处理国家、集体、个人的利益关系。（）
