与真核细胞相比，原核细胞在DNA复制、转录与翻译上具有（）的特点。
参考答案：时空连续性
现代着装艺术，更讲究服饰的整体效果与品位。
A．习惯
B．议论
C．爱好
D．重视
Declaration documents, import and export documents, contracts and other data directly related to import and export transactions shall be retained for ______ effective from the date of release of import and export goods.
A. one year B. two years C. three years D. four years
