5. A. its B. their C. it D. theirs
B. Read the passage carefully, then choose the correct answers: (1.25 p)
Between the Revolutionary period and the World War I, the United States post office was set out to improve
transportation of the post office mails. From those early days to the present, the post office has helped develop and
subsidize every new mode transportation in the United States. Transportation has been the most important element in
mail delivery. Even when the general public had still suspected of the security of a new means of transportation, the
post office experimented with inventions that offered potential for moving the mail faster, occasionally suffering
embarrassment, ridicule, or even abuse in the process.
As mail delivery evolved from foot to horseback, stagecoach, steamboat, railroad, automobile, and airplane, with
intermediate and overlapping use of balloons, and helicopters, post office mail contracts ensured the income necessary
to build the great highways, rail lines, and airways that eventually spanned the continent.
By the turn of the 19
thcentury, the U.S. Post Office had purchased a number of stagecoaches for operation on the
nation’s better post roads – a post road being any road on which the mail travels – and continued to encourage new
designs to improve passenger comfort and carry mail safely.
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