TOEFL(托福)全真测试题集 3
READINGCOMPREHENSION
Questions 1-9
The ocean bottom ------a region nearly 2.5 times
greater than the total land area of the
Earth ---- is a vast frontier that even today is largely unexplored and uncharted. Until
about a century ago, the deep-ocean floor was completely inaccessible, hidden beneath
waters averaging over 3,600 meters deep. Totally without light and subjected to intense
pressures hundreds of times
greater than at the Earth’s surface, the deep-ocean bottom
is a hostile environment to humans, in some ways as forbidding and remote as the void
of outer space.
Although researchers have taken samples of deep-ocean rocks and sediments for
over a century, the first detailed global investigation of the ocean bottom did not
actually start until 1968, with the beginning of the National Science Foundation’s Deep
Sea Drilling Project (DSDP).Using techniques first developed for the offshore oil and
gas industry, the DSDP’s drill ship, theGlomar Challenger, was able to maintain a
steady position on the ocean’s surface and drill in very deep waters, extracting samples
of sediments and rock from the ocean floor.
The Glomar Challenger completed 96 voyages in a 15-year research program that
ended in November 1983. During this time, the vessel logged 600,000 kilometers and
took almost 20,000 core samples of seabed sediments and rocks at 624 drilling sites
around the world. The Glomar Challenger’s core samples have allowed geologists
to reconstruct what the planet looked like hundred of millions of years ago and to
calculate what
it will probably look like millions of years in the future. Today, largely
on the strength of evidence gathered during the Glomar Challenger’s voyages, nearly
all earth scientists agree on the theories of plate tectonics and continental drift that
explain many of the geological processes that shape the Earth.
The cores of sediment drilled by the Glomar Challenger have also yielded
information critical to understanding the world’s past climates. Deep-ocean sediments
provide a climatic record stretching back hundreds of millions of years,
because they
are largely isolated from the mechanical erosion and the intense chemical and biological
activity that rapidly destroy much land-based evidence of past climates. This record has
already provided insights into the patterns and causes of past climatic change ---
information that may be used to predict future climates.
1.The author refers to the ocean bottom as a "frontier" in line 2
because
it (A)is not a popular area for scientific research
(B)contains a wide variety of life forms
(C)attracts courageous explorers
(D)is an unknown territory
2.The word "inaccessible" in line 3
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is closest in meaning to
(A)unrecognizable
(B)unreachable
(C)unusable
(D)unsafe
3.The author mentions outer space in line 7
because
(A)the Earth’s climate millions of years ago was similar to conditions in outer space.
(B)
it is similar to the ocean floor in being alien to the human environment
(C)rock formations in outer space are similar to those found on the ocean floor
(D)techniques used by scientists to explore outer space were similar to those used in ocean
exploration
4. Which of the following is true of the Glomar Challenger?
(A)
It is a type of submarine.
(B)
It is an ongoing project.
(C)
It has gone on over 100 voyages
(D)
It made
its first DSDP voyage in 1968
5. The word " extracting " in line 13 is closest in meaning to
(A) breaking
(B) locating
(C) removing
(D) analyzing
6. The deep Sea Drilling Project was significant
because
it was
(A) an attempt to find new sources of oil and gas
(B) the first extensive exploration of the ocean bottom
(C) composed of geologists form all over the world
(D) funded entirely by the gas and oil industry
7. The word " strength " in line21 is closest in meaning to
(A)basis
(B)purpose
(C)discovery
(D)endurance
8.The word " they " in line26 refers to
(A)years
(B)climates
(C)sediments
(D)cores
9.Which of the following is NOT mentioned in the passage as being a result of the Deep Sea
Drilling Project?
(A) Geologists were able to determine the Earth’s appearance hundreds of millions of years ago.
(B) Two geological theories
became more widely accepted
(C) Information was revealed about the Earth’s past climatic changes.
(D) Geologists observed forms of marine life never before seen.
Question 10-21
Basic to any understanding of Canada in the 20 years after the Second World War is
the country’s impressive population growth. For every three Canadians in 1945, there
were over five in 1966. In September 1966 Canada’s population passed the 20 million
mark. Most of this surging growth came from natural increase. The depression of the
1930’s and the war had held back marriages, and the
catching-up process began after
1945. The baby boom continued through the decade of the1950’s, producing a
population increase of nearly fifteen percent in the five years from 1951 to 1956. This
rate of increase had been exceeded only once before in Canada’s history, in the decade
before 1911. when the prairies were being settled. Undoubtedly, the good economic
conditions of the 1950’s supported a growth in the population, but the expansion also
derived from a trend toward earlier marriages and an increase in 
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;the average size of
families. In 1957 the Canadian birth rate stood at 28 per thousand, one of the highest in
the world.
After the pe