俄国近代历史的重大转折点——__________________
俄国1861年改革
纳米是一种长度单位,常用于度量物质原子的大小。已知某种植物孢子的直径为45纳米,用科学记数法表示该孢子的直径为( )米(1纳米= 10-9米)。
—What are you going to give your mother for her birthday, Lucy?
—I'm not sure. But I'll buy her ______. [ ]
A. something special
B. anything special
C. special anything
D. special something