单选题 This teaching method is a ______ of many methods which have been used for decades in the country.
A. symposium B. symphony C. spectrogram D. synthesis

【正确答案】 D
【答案解析】[解析] D项“synthesis综合，合成”符合题意。其他三项“A项symposium讨论会；B项symphony交响曲；C项spectrogram光谱图”都不正确。本题空格处是说这种教学方法是很多方法的综合。因此D项为正确答案。