多选题 The sound produced by the youth orchestra was so ______ that even its least experienced members were abashed.

A、 cacophonous
B、 euphonious
C、 discordant
D、 collaborative
E、 mellifluous
F、 harmonic

【正确答案】 A、C

【答案解析】[解析] ●so...that...说明前后同义重复。
●空格与abashed(羞愧的)同义重复。
●cacophonous刺耳的，euphonious悦耳的，discordant剌耳的，collaborative协作的，mellifluous悦耳的，harmonic悦耳的。答案选AC。
●注：这里euphonious，mellifluous和harmonic是干扰项，同表示“悦耳的”，并且与正确选项构成反义词。