下列能吃上稻米饭的原始居民是　　[ ]

A、半坡居民　　

B、河姆渡居民　　

C、元谋人　　

D、北京人

---Millie，is there anything else you want to know about Yangzhou paper cutting?

---Yes，I am still wondering __________ .

A．how is the Yangzhou paper cutting made

B．when did the Yangzhou paper cutting start

C．how many paper cutting museums are there in Yangzhou now

D．if the students learn paper cutting at school