题目内容：
根据下面材料，回答题：Music comes in many forms; most countries have a style of their own.____76___the turn of thecentury when jazz was born, America had no prominent style of its own. No one knows exactly whenjazz was____77___,or by whom. But it began to be heard in the early 1900s. Jazz is America's contribu-tion to____78___music. In contrast to classical music, which follows formal European traditions, jazz isspontaneous and free form. It bubbles with energy,____79___the moods, interests, and emotions of thepeople. In the 1920s jazz sounded like America, and____80___it does today. The origins of this musicare as interesting as the music____81___. American Negroes, or blacks, as they are called today, werethe jazz pioneers. They were brought to Southern States____82___slaves. They were sold to plantationowners and forced to work long hours. When a Negro died his friend and relatives____83___a processionto carry the body to the cemetery. In New Orleans, a band often accompanied the procession. On theway to the cemetery the band played slow, solemn music suited to the occasion.____84___on the wayhome the mood changed. Spirits lifted. Death had removed one of their relations, but the livings wereglad to be alive. The band played____85___music, improvising(即兴表演) on both the harmony andthe melody of the tunes presented at the funeral. This music made everyone want to dance. It was anearly form of jazz.
orm of jazz.
_________ A．By
B．At
C．In
D．On
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