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Practice Reading: Fill in the Blanks (Dropdown) ID: #38903 The story
Instructions
The    story    of    man's    mastery    of    the    air    is    almost    as    old    as    man    himself,    a    puzzle    in    which    the    essential    were    not    found    until    a    very    late    stage.    However,    to    understand    this    we    must    first    go    back    to    the    time    when    primitive    man    hunted    for    his    food,    and    only    birds    and    insects    flew.    We    cannot    know    with    any    certainty    when    man    first    deliberately    shaped    weapons    for    throwing,    but    that    act    of    conscious    design    marked    the    first    step    on    a    road    that    from    the    spear    and    the    arrow    to    the    aeroplane    and    the    giant    rocket    of    the    present  .  It    would    seem,    in    fact,    that    this    to    throw    things    is    one    of    the    most    primitive    and    deep-seated    of    our    instincts,    in    childhood    and    persisting    into    old    age.  

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