3. 格林先生要你馬上去他的辦公室見他。

 Mr. Green asked you to see him in his office。

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  If you drop a feather and a hammer ( 鐵錘） , which do you think will hit the ground first?

  On his last moon walk in 1971,Apollo 15's Commander David Scott did his final 21 for the television cameras. Scott was re-creating an experiment  22 by the astronomer Galileo in 1590.

  If you guess that the 23 would hit the ground first,you' re not alone. When Galileo was a boy,everyone 24 that heavier things fell faster. A rock twice as heavy as a potato should fall twice as fast. That's what they 25 in school.

  But Galileo wasn’ t so 26 . So he decided to 27 it. He dropped balls of different 28 from towers and timed how long they took to get to the ground. And he discovered 29 amazing — dropped things fall at the same rate,no matter how 30 they are.

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  And sure enough,when Scott let the hammer and the feather drop,they hit the ground 一 exactly 39.

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