Sarah felt like         when she found out that she had been chatting online with a boy student of her same class.

A．cry

B．to cry

C．being crying

D．crying

在下列对净现值与折现率关系的描述中，正确的是( )。

A．折现率越大，净现值越大

B．折现率越大，净现值越小

C．折现率越小，净现值越大

D．净现值随折现率的增大呈单调递减趋势

E．折现率越小，净现值越小