与传统农业不同，现代农业企业中居于生产要素首位的是（）。

A.劳动力

B.土地

C.技术

D.资本

--How do you like the plan put forward by Mr.Smith?

--- Considering its real _____ , it will be worth having a try.

A．price

B．value

C．cost

D．expense