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As settlers moved to California in the mid-nineteenth
century, they became concerning about the S1.______
lack of rapid communication with the eastern United
States. Because the many dangers and hardships of S2.______
crossing the West, mails often did not arrive. The S3.______
most important mail was therefore sent via Panama,
took a month or more. S4.______
In 1860 a stagecoach company decided to meet S5.______
a problem by beginning the Pony Express. The
company hired the bravest riders bought the fastest horses S6.______
to be used as relay teams between Missouri with California, S7.______
and the company promised that mail would be
delivering in ten days. The company established two S8.______
hundred stations along the route on which riders could S9.______
rest and change horse. In fewer than two years, however, S10.______
telegraph lines to San Francisco were completed
and the Pony Express was no longer needed.
【S1】

    A.______
    lack
    B.______
    crossing
    C.______
    most
    D.______
    E.______
    a
    F.______
    to
    G.______
    and
    H.______
    hundred
    I.______
    rest
    J.______
    telegraph
    K.
    【S1】
【参考答案】

把concerning改为concerned。
把concerning改为concerned。 解析:固定搭配中......

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