采用收益还原法评估土地价格时，如果( )，则选择如下公式：

A．土地纯收益按某一常量逐年递增
B．土地纯收益按某一常量逐年递减
C．土地纯收益按某一固定比率逐年递增
D．土地纯收益按某一固定比率逐年递减

听力原文：W. What can I do for you?M. It' s about the new clerks you need for the offices. I' m wondering how many people you want to employ.W. That depends on what you would like.M. I think I' d need about 30 hours a week, including some Saturdays. What do you think?W: That's what I was thinking tm. We don't want someone who has never worked in an office before.M. Yes. It might be helpful if they could speak a second language.W: But that might prevent too many people from applying. What about pay, David?M: What do you think we should offer?W. I think it depends on experience. However, the lowest we could offer is about $ 9,000 per year.What was the name of the man?A．Dick.B．Davy.C．David.

A.
W.
B.
M.
C.
M.
D.
W:
E.
What
F.Dick.
B．Davy.
C．David.

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（）是指由外部轮廓线条构成的矢量图，即由计算机绘制的直线、圆、矩形、曲线图表等。

A．图像
B．图形
C．像素
D．画面

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