（）运输进口烟草专卖品都必须由国家烟草专卖行政主管部门签发相应准运证。
参考答案：错
— Have you found anything interesting?
— None of the information ________ particularly useful to me. [ ]
A. is
B. are
C. have
D. has
白斑的病理特征是（）
A.上皮角化层出现角质栓塞
B.上皮基底细胞液化变性及基底膜界限不清
C.上皮增生伴有异常增生
D.上皮萎缩、上皮异常增生或原位癌
E.上皮明显增厚但细胞分化较好
