Sleep actually occurs __________, though one may receive clues signaling its _________ for several minutes before one falls asleep.
gradually adv. 逐步的...abruptness n. 突然的
erratically adv. 不确定的,不可靠的...solace n. 安慰
temporarily adv. 暂时的...length n. 长度
inevitably adv. 不可避免的...approach n. 接近
instantaneously adv. 即刻,突如其来的...onset n. 开始,发生
6. 艾伦斯瓦托理查兹,一个在美国的_________环境保护者,在十九世纪举行运动来__________在一个领域里可靠的实践,后来被称之为生态学。
Ellen Swallow Richard, a _________ environmental preservation in the United States, campaigned during the nineteenth century to _________ responsible practices in the discipline that has come to be known as ecology.
foil for 阻止,挡开...expose v. 曝光,揭露
pioneer of 倡导,先驱者...implement v. 实现,实施
resource on 资源...squelch v. 压制,限制
mitigator of 减轻...promote v. 提升,促进
critic of 批评家...exploit v. 剥削,开采
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