Changes of fashion and public taste are often ------- and resistant to analysis, and yet they are among the most ------- gauges of the state of the public’s collective consciousness.
transparent…useful
ephemeral…sensitive (Answer)
faddish…underutilized
arbitrary…problematic
permanent (Doubt) …reliable
for the first blank: idea_1 and resistant to analysis….
so, the idea1 is same thing as “resistant to analysis”, if the blank was “permanent” then the whole idea 1 would be: “Changes of fashion and public taste are often permanent” which as a whole also represent the same idea that it is resistant to analysis as the change is permanent.