[問題] 問一題普生課本附贈的網路問題

[Dragoon (咦~出新歌啦?)]

Water potential begins to become less negative
  A) in the dark of the night
  B) just before dawn
  C) at sunrise
  D) at noon
  E) just after sunset

答案是(E)

不知道為什麼啊??

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