—Peter，is there anything else you want to know about China?

—Yes，I am still wondering __________ .

A．how is Chinese paper cut made

B．how was the Great Wall built in ancient times

C．why the Chinese people like to play the dragon dance

D．why do the Chinese people eat rice dumplings at Dragon Boat Festival

2009年是中俄建交60周年，两国不断加深政治互信，在经贸、能源等领域展开务实合作，举行联合军事演习，使中俄战略协作伙伴关系更进了一步。这主要是因为

①中俄两国存在广泛的共同利益

②中俄两国人民存在着传统友谊

③我国一贯重视与周边国家的军事合作

④我国致力于维护世界和平，促进共同发展

A．①③

B．②③

C．①④

D．②④