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21.沙丁鱼每年5~7月从集聚地向产卵地大迁徙的原因有()①沿岸冷流向东北流动,利于沙丁鱼顺流迁徙②沿岸寒流降低了产卵地海域水温,提供了冷水生存环境③沿岸寒流与外海的暖流交汇,为沙丁鱼带来丰富饵料④附近陆地河流处于丰水期,带给产卵地海域丰富的营养物质A.①②③B.②③④C.①②④D.①②③④
29. What does the underlined word“that”in Paragraph 2 refer to?A.Infants need much more sleep than adults.B. Most scientists have a rough estimate of the best amount of sleep.C. It seems that the amount of sleep you need depends upon your ageD.It seems that around seven and a half hours’sleep is a good amount.30. What is the factor in considering how much sleep you need?