品质因素为C1F的烤烟烟叶,杂色面积10%,残伤15%,则该烟叶应定为()。
A.C1F
B.C2F
C.C3F
D.C4F
参考答案:C
保险合同是一种()的保障性合同。
A.无偿
B.单务
C.诺成
D.有偿、双务
—I didn’t tell him the news.
—Oh, you ought _______.
A.to
B.not to
C.not to have
D.to have