"The Diaoyu Islands ______ Chinese territory since ancient times," Premier Wen Jiabao

stressed during the conversation with Japanese Prime Minister. [ ]

A. were

B. have been

C. had been

D. are

封面设计的表现形式很多，通常运用（）、（）、摄影和图案作为设计元素进行设计。完整的书封设计是（）、（）、（）的统一设计，在设计时要认真考虑。