北方地区的农业耕作制度是[ ]
A．一年一熟或两年三熟
B．一年两熟
C．一年两熟或两年三熟
D．一年三熟
答案：A
His movie won several awards at the film festival, ______ was beyond his wildest dream.
A．which
B．that
C．where
D．it
上述疾病，有口腔黏膜斑体征的是（）
A.麻疹
B.风疹
C.猩红热
D.手足口病
E.水痘
