1 . I don’t think it serves anyone if you force yourself to be selfless in a way that’s not   ________.

A．optimistic

B．systematic

C．automatic

D．authentic

2 . People tend to doubt whether paintings purchased at a relatively low price are authentic

A．authentic

B．controversial

C．tentative

D．flexible

3 . —How will you spend this summer vacation?
—I have made a(n) ____plan to take a trip to Jiuzhaigou. The schedule might be subject to change.

A．arbitrary

B．authentic

C．tentative

D．tight

4 . Foreign students and their families can sample the charm of traditional Chinese culture through______Peking Opera performance.

A．authentic

B．autonomous

C．artificial

D．ambiguous