我们平时吃的米饭，是由哪种农作物加工而来的？（）
A.小麦
B.粟
C.水稻
D.青稞
参考答案：C
We have run ______ rice, we will have to buy some this afternoon.[ ]
A. out
B. of
C. out of
D. out to
盐酸麻黄碱有几个光学异构体
A．两个
B．三个
C．四个
D．五个
E．六个
