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