人力资源的( ),是指一定的人力资源必然表现为一定的人口数量。
A.有限性
B.可用性
C.物质性
D.能动性
参考答案:B
—Who is the girl in the picture?
—Haha! It's me! The picture _____ ten years ago. [ ]
A. took
B. is taken
C. was taken
D. has taken
比较图中的两个阴影部分I和Ⅱ的面积,它们的大小关系是()
A.I>Ⅱ
B.I<Ⅱ
C.I=Ⅱ
D.无法比较