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ÀýÒ»£ºPerhaps, some scientists thought, migrants determine their geographic position on Earth by celestial navigation, almost as human navigators use stars and planets, but this would demand of the animals a fantastic map sense. (Ñ¡×ÔN0.6ÌâÌ×section 1¶ÌÎÄÕÂ)
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(A) observe high phytoplankton numbers under natural lake conditions
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(B) discover negative correlations between algae and zooplankton numbers from their field research
(C) understand the central importance of environmental factors in controlling the growth rates of phytoplankton
(D) make verifiable correlations of cause and effect between zooplankton and phytoplankton numbers
(E) invent laboratory techniques that would have allowed them to bypass their field research concerning grazer control
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Àý£ºThe author suggests that, before the early 1950¡¯s, most historians who studied preindustrial Europe did which of the following?(Ñ¡×ÔNO.6µÚÈýÌ×section 4 ³¤ÎÄÕÂ)
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