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从方框中选择合适的词,用其适当的形式填空 above, for, across, history, serve, dou

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从方框中选择合适的词,用其适当的形式填空
above, for, across, history, serve, double, possible, enter, build, be
                                      The Channel Tunnel (英吉利海峡隧道)
       In 1858, a French engineer, Aim? Thome de Gamond, arrived in England with a plan for a
twenty-one mile tunnel   1   the English Channel. He said that it would be   2   to build a platform
in the center of the Channel. This platform   3   as a port and a railway station. The tunnel would
be well-ventilated (通风好的)  if  tall chimneys were built   4   sea-level(海平面).  In 1860, a
better plan was put forward(提出) by an Englishman,  William Low.  He suggested that a   5  
railway tunnel should be built. This would solve the problem of ventilation,     6   if a train   7   this
tunnel, it would draw in (吸入) fresh air behind it. Forty-two years later a tunnel was actually
begun. If, at the time, the British had not feared invasion(入侵), it would have been completed.
Recently, there has again   8   great interest in the idea of a Channel Tunnel.  If it   9   ,  it will
connect (连接) Britain to Europe for the first time in   10   .
1. across   2. possible   3. would serve   4. above    5. double   6. for   7. entered    8. been    
9. is built 10. history