（4）Now to have taste or discernment requires a capacity for thinking things through to the bottom, an independence of judgment, and an unwillingness to be knocked down by any form of fraud, social, political, literary, artistic, or academic.

A．people of higher status are less likely to be stricken with diarrhea
B．diarrhea is no longer a serious disease in the modem world
C．diarrhea has been a threat to humanity throughout history
D．the elderly are more likely attacked by diarrhea than the young

A．take the normal behavior for granted
B．make the natural seem strange
C．study abnormal competences
D．make easy things difficult