把x4-16y4进行因式分解(在有理数范围内):
x4-16y4,
=(x2+4y2)(x2-4y2),
=(x2+4y2)(x+2y)(x-2y).
_____ I know the money is safe, I shall not worry about it. [ ]
A. Even though
B. Unless
C. As long as
D. While
下图为日本山河分布示意图和富山市气温和降水季节分布示意图,读图完成问题。日本IT工业集中在甲岛,因此该岛被称为“硅岛”,其原因是该岛()①环境洁净②资源丰富③现代高速交通便利④劳动力丰富⑤科技发达
A.①②③
B.①③⑤
C.②④⑤
D.③④⑤