With a huge amount of food ________, all of the staff are busy preparing for the dinner tonight.[      ]

A. would serve 

B. served

C. to serve 

D. serving

在0，1，2三个数中任取两个．

（1）用树状图（或列表）法表示出所有的可能情况；

（2）求任取的两个数构成的两位数是奇数的概率．