The Chinese abacus(算盘), officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.

A．having listed

B．listed

C．having been listed

D．listing

农产品协定在市场准入方面的规定包括（）

A、取消非关税措施，将其关税化

B、进行关税减让

C、规定关税配额

D、规定具体商品的配额