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ENGLISH FOR ACADEMIC PURPOSES

(15) the water in the upper tubes is far cooler than the water at the bottom. The weight of
the water puts pressure on the column, and this raises the boiling point of the water
near the bottom. Finally. the water in the upper part of the column warms and expands.
some of it welling out of the mouth of the geyser. This decreases the pressure on the
superheated water, which abruptly turns to steam. This in turn forces all the water and
(20)
vapor out of the geyser.

5. It can be inferred from the passage that the earthquake of 1959 made Old Faithful geyser
erupt
___ (A) more frequently
___ (B) less regularly
___ (C) more suddenly
___ (D) less spectacularly
6. Why does the author mention a rainbow in line 7?
___ (A) The column of water forms an arc in the shape of a rainbow.
___ (B) In the sunlight, the column of water may produce the colors of the rainbow.
___ (C) Rainbows can be seen quite frequently in Yellowstone National Park.
___ (D) The rainbow. like the geyser. is an example of the beauty of nature.
7. The passages implies that Old Faithful would probably not erupt at all if
___ (A) the tubes of the geyser system were very wide
___ (B) the climate suddenly changed
___ (C) there had not been an earthquake in 1959
___ (D) the underground tubes were longer

Questions 8-12

In 1881, a new type of weed began spreading across the northern
Great Plains. Unlike other weeds, the tumbleweed did not spend
its life rooted to the soil; instead it tumbled and rolled across
(line) fields in the wind. The weed had sharp, spiny leaves that could
(5) lacerate the fresh of ranchers and horses alike. It exploited the
vast area of the plains, thriving in regions too barren to
support other plants. With its ability to generate and
disseminate numerous seeds quickly, it soon became the scourge of
the prairies.
(10) To present-day Americans, the tumbleweed symbolizes the Old
West. They read the Zane Grey novels in which tumbleweeds drift
across stark western landscapes and see classic western movies in
which tumbleweeds share scenes with cowboys and covered wagons.
Yet just over a century ago, the tumbleweed was a newcomer. The
(15) first sign of the invasion occurred in North and South Dakota in
the late 1870's.
Farmers had noticed the sudden appearance of the new unusual
weed. One group of immigrants, however, did not find the weed at
all unfamiliar. The tumbleweed. it turns out, was a native of
(20) southern Russia. where it was known as Tartar thistle. It was
imported to the United States by unknown means.

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