托福阅读历年真题精选30
Questions 31-39Perhaps one of the most dramatic and important changes that took place in the
Mesozoic era occurred late in that era, among the small organisms that populate the
uppermost, sunlit portion of the oceans--the plankton. The term "plankton" is a broad
Line one, designating all of the small plants and animals that float about or weakly propel
(5) themselves through the sea. In the late stages of the Mesozoic era. during the Cretaceous
period, there was a great expansion of plankton that precipitated skeletons or shells
composed of two types of mineral: silica and calcium carbonate. This development
radically changed the types of sediments that accumulated on the seafloor, because,
while the organic parts of the plankton decayed after the organisms died, their mineralized
(10) skeletons often survived and sank to the bottom. For the first time in the Earth's long
history, very large quantities of silica skeletons, which would eventually harden into rock,
began to pile up in parts of the deep sea. Thick deposits of calcareous ooze made up of
the tiny remains of the calcium carbonate-secreting plankton also accumulated as never
before. The famous white chalk cliffs of Dover, in the southeast of England, are just one
(15) example of the huge quantities of such material that amassed during the Cretaceous
period; there are many more. Just why the calcareous plankton were so prolific during
the latter part of the Cretaceous period is not fully understood. Such massive amounts
of chalky sediments have never since been deposited over a comparable period of time.
The high biological productivity of the Cretaceous oceans also led to ideal conditions
(20) for oil accumulation. Oil is formed when organic material trapped in sediments is slowly
buried and subjected to increased temperatures and pressures, transforming it into
petroleum. Sediments rich in organic material accumulated along the margins of the
Tethys Seaway, the tropical east-west ocean that formed when Earth's single landmass
(known as Pangaea) split apart during the Mesozoic era. Many of today's important oil
(25) fields are found in those sediments--in Russia, the Middle East, the Gulf of Mexico, and
in the states of Texas and Louisiana in the United States.
31. What does the passage mainly discuss?
(A) How sediments were built up in oceans during the Cretaceous period
(B) How petroleum was formed in the Mesozoic era
(C) The impact of changes in oceanic animal and plant life in the Mesozoic era
(D) The differences between plankton found in the present era and Cretaceous plankton
托福阅读历年真题精选30
32. The passage indicates that the Creiaceous period occurred</p>(A) in the early part of the Mesozoic era(B) in the middle part of the Mesozoic era
(C) in the later part of the Mesozoic era
(D) after the Mesozoic era
33. The passage mentions all of the following aspects of plankton EXCEPT
(A) the length of their lives
(B) the level of the ocean at which they are found
(C) their movement
(D) their size
34. The word "accumulated" in line 8 is closest in meaning to
(A) depended
(B) matured
(C) dissolved
(D) collected
35. According to the passage, the most dramatic change to the oceans caused by plankton during
the Cretaceous period concerned
(A) the depth of the water
(B) the makeup of the sediment on the ocean floor
(C) the decrease in petroleum-producing sediment
(D) a decline in the quantity of calcareous ooze on the seafloor
36. The "white chalk cliffs of Dover" are mentioned in line 14 of the passage to
(A) show where the plankton sediment first began to build up
(B) provide an example of a plankton buildup that scientists cannot explain
(C) provide an example of the buildup of plankton sediment
(D) indicate the largest single plankton buildup on Earth
37. The word "prolific" in line 16 is closest in meaning to
(A) fruitful
(B) distinct
(C) determined
(D) energetic
38. The word "ideal" in line 19 is closest in meaning to
(A) common
(B) clear
(C) perfect
(D) immediate
39. The word "it" in line 21 refers to
(A) biological productivity
(B) oil
(C) organic material
(D) petroleum
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