某公司当初以100万元购入一块土地，目前市价为80万元，如欲在这块土地上兴建厂房，则项目的机会成本为（）。

A.100万元

B.80万元

C.20万元

D.180万元

It's quite strange that the man sleeps with his mouth ____ and his eyes ____. [ ]

A. closed; open

B. closed; opened

C. closing; open

D. closing; opening