( )是项目国民经济评价的主要指标。
A．经济净现值
B．经济内部收益率
C．财务内部收益率
D．财务净现值
参考答案：B
He came to my class every week, but his attitude ________ he was not really interested in the subject. [ ]
A. expressed
B. described
C. explained
D. suggested
消费者消费需求具有伸缩性，以下属于外因影响的有（）。
A.消费者本身的需求欲望
B.服务水平
C.产品供应
D.广告宣传
