________ clear nights, you can clearly see the Milky Road across the night sky．


  1. A.
    In
  2. B.
    At
  3. C.
    On
  4. D.
    During
C
泛指的晚上用at night；加the時用in the night；具體的某一天晚上用on。
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Supporting details

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itself with the big earth magnet to point north and south．When people discovered that idea about athousand years ago and invented the compass，it allowed sailors to navigate (航海)on oceanvoyages, even under

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Passage outline

Supporting details

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itself with the big earth magnet to point north and south．When people discovered that idea about athousand years ago and invented the compass，it allowed sailors to navigate (航海)on oceanvoyages, even under

cloudy skies.

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A common bird that does not migrate but is great at finding its way home is the homing pigeon．Not all pigeons can find their way home．Those that can are very good at it，and they have been widely studied．

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mud of ponds and marshes．He found accidentally little rod-like bacteria that all swam together in

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Passage outline

Supporting details

The existence of the earth magnet and the invention of the navigating compass

◇Our earth is a big magnet and a little freely (71)   ▲ 

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◇(72)   ▲   on the idea above, the navigating compass was invented.

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◇ One piece of evidence is the (73)   ▲    of many birds between their summer homes and winter homes.

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◇Little magnets were tied to the pigeons’ heads to (76)   ▲     their magnetic sense.

◇The pigeons’ magnetic sense seemed to be affected on (77)   ▲    days.

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