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跟踪检查的主要工作是()。
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听力原文： Each night we alternate between two kinds of sleep: active sleep and passive sleep. The passive sleep gives our body the rest that is needed, and prepares us for active sleep, in which dreaming takes place. And we arc beginning to understand the importance of the dream period in our sleep cycles.
In passive sleep the body is at rest. We move very little. And the brain becomes very inactive, ff a person continues to sleep, she or he enters anew period, a more active period. The body goes through several changes: the brain temperature rises, blood in the brain increases, the body becomes very still and the brain goes into active state. And as the brain goes active, the eyes begin to move rapidly. And that is the sign of another change---the person is dreaming. Throughout the night, people alternate between passive and active sleep. Doctors have studied the sleep cycle and have found that everyone dreams---in fact, that everyone needs to dream in order to stay healthy. It appears we need both kind of sleep. We need passive sleep in order to rest our bodies. We need active sleep in order to dream. And dreaming helps us to rest our minds,
What does not happen in the brain in the active sleep？
军队系统的审计管辖范围由()确定。
任何只在借方登记或贷方登记，而无对应的贷方或借方记录，或者借贷金额不相等的记录，都是错误的会计记录。 ()
Music comes in many forms; most countries have a style. of their own.【C1】______ the turn of the century when jazz was born, America had no prominent【C2】______ of its own. No one knows exactly when jazz was【C3】______ or by whom. But it began to be【C4】______ in the early 1900s. Jazz is America’s contribution to【C5】______ music. In contrast to classical music, which【C6】______ formal European traditions, jazz is spontaneous and free form. It bubbles with energy,【C7】______ the moods, interests, and emotions of the people. In the 1920s jazz【C8】______ like America, and【C9】______ it does today. The【C10】______ of this music are as interesting as the music【C11】______ American Negroes, or blacks, as they are called today, were the jazz【C12】______ . They were brought to Southern States【C13】______ slaves. They were sold to plantation owners and forced to work long【C14】 ______ When a Negro died his friend and relatives【C15】______ a procession to carry the body to the cemetery. In New Orleans, a band often accompanied the【C16】______ on the way to the cemetery the band played slow, solemn music suited to the occasion.【C17】______ on the way home the mood changed, Spirits lifted. Death had removed one of their【C18】______ , but the living were glad to be alive. The band played 【C19】V music, improvising on both the harmony and the melody of the tunes【C20】______ at the funeral. This music made everyone want to dance. It was an early farm of jazz.
【C1】
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