Mild electric current had been thought to______overactive brain regions that cause disease, but in some cases, it may boost nerves' activity and change their firing patterns.

A． genteel… uncertainty
B． infectious … pulchritude
C． idolatrous… pluck
D． obsequious … vivacity
E． insufferable … vapidity

A． incredible : euphemistic
B． elaborate : fluent
C． expressed : ambiguous
D． burnished : lustrous
E． distinguished : cryptic