The engine that became standard on western steamboats
was of a different and novel design. It was the work primarily
of an unsung hero of American industrial progress, Oliver
Evans(1755-1819). The self-educated son of a Delaware
farmer. Evans early became obsessed by the possibilities of
mechanized production and steam power. As early as 1802 he
was using a stationary steam engine of high-pressure design in
his mill. Engines of this type were not unknown, but before
Evans they were generally considered impractical and
dangerous.
Within a decade the high-pressure engine, the new type,
had become standard on western waters. Critics ignorant of
western conditions often attacked it as wasteful and dangerous.
But people who really knew the Ohio, the Missouri, and
the Mississippi insisted, with good reasons, that it was the only
engine for them. In shallow western rivers the weight of
vessel and engine was important; a heavy engine added to the
problem of navigation. The high-pressure engine was far
lighter in proportion to horsepower, and, with less than half
as many moving parts, was much easier and cheaper to repair.
The main advantages of low-pressure engines were safe operation
and economy of fuel consumption, neither of which meant
much in the West.
33.What is the passage mainly about?
(A) Streamboat engines in the western United States
(B) River travel in the western United States
(C) A famous United States inventor
(D) The world’s first practical streamboat
34.What was the Clermont (line14)?
(A) A river
(B) A factory
(C) A boat
(D) an engine
35.Who developed the kind of stream engine used on western streamboats?
(A) Watt
(B) Boulton
(C) Fulton
(D) Evans
36.The word "novel" in line 18 is closest in meaning to
(A) fictional
(B) intricate
(C) innovative
(D) powerful
37.What option of Evans is suggested by the use of the term "unsung hero" in line 18?
(A) More people should recognize the importance of his work.
(B) More of his inventions should be used today.
(C) He should be credited with inventing the stream engine.
(D) More should be learned about his early life.
38.What does the author imply about Evans?
(A) He went to England to learn about stream power.
(B) He worked for Fulton.
(C) He traveled extensively in the West.
(D) He taught himself about stream engines.
39.The word "stationary" in line 23 is closest in meaning to
(A) single
(B) fixed
(C) locomotoiv
(D) modified