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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 46 to 55.    A rather surprising geographical feature of Antarctica is that a huge freshwater lake, one of the world’s largest and deepest, lies hidden there under four kilometers of ice. Now known as Lake Vostok, this huge body of water is located under the ice block that comprises Antarctica. The lake is able to exist in its unfrozen state beneath this block of ice because its waters are warmed by geothermal heat from the earth’s core. The thick glacier above Lake Vostok actually insulates it from the frigid temperatures on the surface.   The lake was first discovered in the 1970s while a research team was conducting an aerial survey of the area. Radio waves from the survey equipment penetrated the ice and revealed a body of water of indeterminate size. It was not until much more recently that data collected by satellite made scientists aware of the tremendous size of the lake; the satellite-borne radar detected an extremely flat region where the ice remains level because it is floating on the water of the lake.   The discovery of such a huge freshwater lake trapped under Antarcticais of interest to the scientific community because of the potential that the lake contains ancient microbes that have survived for thousands upon thousands of years, unaffected by factors such as nuclear fallout and elevated ultraviolet light that have affected organisms in more exposed areas. The downside of the discovery, however, lies in the difficulty of conducting research on the lake in such a harsh climate and in the problems associated with obtaining uncontaminated samples from the lake without actually exposing the lake to contamination. Scientists are looking for possible ways to accomplish this.
Câu 1: The word “hidden” in paragraph 1 is closest in meaning to


A. undrinkable


B. untouched 


C. unexploitable 


D. undiscovered
Câu 2: What is true of LakeVostok?


A. It is completely frozen. 


B. It is a saltwater lake.


C. It is beneath a thick slab of ice. 


D. It is heated by the sun.
Câu 3: Which of the following is closest in meaning to “frigid” in paragraph 1?


A. Extremely cold 


B. Easily broken 


C. Quite harsh 


D. Lukewarm
Câu 4: A ll of the following are true about the 1970 survey of AntarcticaEXCEPT that it ______


A. was conducted by air 


B. made use of radio waves


C. could not determine the lake’s exact size 


D. was controlled by a satellite
Câu 5: It can be inferred from the passage that the ice would not be flat if _______.


A. there were no lake underneath 


B. the lake were not so big


C. Antarcticawere not so cold


D. radio waves were not used
Câu 6: The word “microbes” in paragraph 3 could best be replaced by which of the following?


A. Pieces of dust 


B. Tiny bubbles 


C. Tiny organisms 


D. Rays of light
Câu 7: LakeVostokis potentially important to scientists because it


A. can be studied using radio waves 


B. may contain uncontaminated microbes


C. may have elevated levels of ultraviolet light 


D. has already been contaminated
Câu 8: The word “downside” in paragraph 3 is closest in meaning to ______


A. bottom level 


B. negative aspect 


C. underside 


D. buried section
Câu 9: The last paragraph suggests that scientists should be aware of


A. further discoveries on the surface of Antarctica


B. problems with satellite-borne radar equipment


C. ways to study LakeVostok without contaminating it


D. the harsh climate of Antarctica
Câu 10: The purpose of the passage is to______


A. explain howLakeVostokwas discovered


B. provide satellite data concerningAntarctica


C. discuss future plans forLakeVostok


D. present an unexpected aspect ofAntarctica’s geography
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Các câu hỏi liên quan

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
Câu 1: It was not until the late 1970s when these country people could enjoy the benefits of electricity.


A. not until


B. when


C. these country people could enjoy


D. the benefits 
Câu 2: Neither the director nor any members of the staff is working overtime today.


A. Neither 


B. nor any 


C. is


D. overtime
Câu 3: A big wedding requires a lot of preparation, such as sending invitations, hiring costumes and choose dishes.


A. requires


B. preparation


C. sending invitations


D.  and choose
Câu 4: When attempt to explain children’s food preferences, researchers are faced with contradictions.


A. attempt


B.  to explain


C. children’s


D. with
Câu 5: People live in big cities often have trouble making friends. 


A. People live 


B. big cities


C. trouble


D. making friends

A.
B.
C.
D.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.      In addition to the great ridges and volcanic chains, the oceans conceal another form of undersea mountains: the strange guyot, or flat-topped seamount. No marine geologist even suspected the existence of these isolated mountains until they were discovered by geologist Harry H. Hess in 1946. He was serving at the time as a naval officer on a ship equipped with a fathometer. Hess named these truncated peaks for the nineteenth-century Swiss-born geologist Arnold Guyot, who had served on the faculty of Princeton University for thirty years. Since then, hundreds of guyots have been discovered in every ocean but the Arctic. Like offshore canyons, guyots present a challenge to oceanographic theory. They are believed to be extinct volcanoes. Their flat tops indicate that they once stood above or just below the surface, where the action of waves leveled off their peaks. Yet today, by definition, their summits are at least 600 feet below the surface, and some are as deep as 8,200 feet. Most lie between 3,200 feet and 6,500 feet. Their tops are not really flat but slope upward to a low pinnacle at the center. Dredging from the tops of guyots has recovered basalt and coral rubble, and that would be expected from the eroded tops of what were once islands. Some of this material is over 80 million years old. Geologists think the drowning of guyots involved two processes: The great weight of the volcanic mountains depressed the sea floor beneath them, and the level of these  a rose a number of times, especially when the last Ice Age ended, some 8,000 to 11,000 years ago.
Câu 1: What is the author’s main purpose in writing this passage? 


A. To describe one feature of the undersea world 


B. To trace the career of Arnold Guyot 


C. To present the results of recent geologic research 


D. To discuss underwater ridges and volcano chains 
Câu 2: The word “ conceal” is closest in meaning to which of the following? 


A. Hide


B. Create 


C. Erode  


D. Contain 
Câu 3: The passage implies that guyots were first detected by means of 


A.  a deep-sea diving expedition 


B. computer analysis 


C. research submarines


D. a fathometer 
Câu 4: The author indicates that Arnold Guyot 


A. invented the fathometer  


B. taught at Princeton University 


C. was Harry Hess’s instructor  


D. named the guyot after himself 
Câu 5: What does the passage say about the Arctic Ocean? 


A. The first guyot was discovered there. 


B. It is impossible that guyots were ever formed there. 


C. There   are more guyots there than any other ocean.


D. No guyots have ever been found there. 
Câu 6: The author states that offshore canyons and guyots have which of the following characteristic in common?


A. Both are found on the ocean floor near continental shelves. 


B. Both were formed by volcanic activity. 


C. Both were, at one time, above the surface of the sea.


D. Both present oceanographers with a mystery. 
Câu 7: According to the passage, most guyots are found at a depth of 


A. between 600 and 3,200 feet 


B.  more than 8,200 feet 


C. less than 600 feet    


D.  between 3,200 and 6,500 feet 
Câu 8: Which of the following is closest in meaning to the word “rubble”? 


A.  Mixture 


B. Fragments 


C. Core


D. Columns 
Câu 9: According to the passage, which of the following two processes were involved in the submersion of guyots ?


A. Erosion and volcanic activity


B. The sinking of the sea floor and the rising of sea level 


C. High tides and earthquakes


D. Mountain building and the actions of ocean currents 
Câu 10:  According to the passage when did sea level significantly rise? 


A.  From 8,000 to 11,000 years ago  


B. In the nineteenth century 


C. In 1946  


D. 80 million years ago 
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A.
B.
C.
D.

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
Câu 1: The best way to eliminate a pest is to controlling the food accessible to it


A. The best


B. to controlling


C. food accessible


D. it
Câu 2: If protect, a solar cell lasts for a long time and is a good source of energy.


A. protect


B. solar


C.  lasts


D. source of
Câu 3: The oxygen content of Mars is not sufficient enough to support life as we know it.


A. sufficient enough


B. to support


C. as


D. it
Câu 4: The color of the Red Sea is due to a minute alga, or sea plant, whose forms huge patches of a blood red tint.


A. a minute alga


B. sea plant


C. whose


D. forms 
Câu 5: The Alaskan malamute, used extensively for pulling sleds, is closely related about the wolf.


A. used 


B. for pulling 


C. closely


D. about

A.
B.
C.
D.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Câu 1: We can protect the world in which we live. We, for example, can grow more trees and recycle rubbish.


A. We can protect the world in which we live as well as we can grow more trees and recycle rubbish. 


B. We can protect the world in which we live, growing more trees and recycle rubbish. 


C. We can protect the world in which we live by growing more trees and recycling rubbish.


D. We can protect the world in which we live such as growing more trees and recycling rubbish.
Câu 2: He joined the army in 1998. He was soon after promoted to the rank of captain.


A. He was promoted to the rank of captain in 1998 and joined the army. 


B. Promoted to the rank of captain in 1998, he joined the army soon later. 


C. He worked as a captain in the army and had a promotion in 1998. 


D. Joining the army in 1998, he was soon promoted to the rank of captain.
Câu 3: He has been studying for many years. He should have realized sooner that his grammar was incorrect.


A. He has been studying for many years to have soon realized that his grammar was incorrect.


B. He has been studying for many years that he should have realized sooner that his grammar was incorrect.


C. No sooner has he been studying for many years than he should have realized that his grammar was incorrect.


D. Though he has been studying for many years, he did not realize sooner that his grammar was incorrect.
Câu 4: Colour is an important facet of nature. It influences the life of almost every creature.


A. Influencing the life of almost every creature in nature, colour is important. 


B. Colour influencing the life of almost every creature being an important facet of nature.


C. Colour, which is an important facet of nature, influencing the life of almost every creature.


D. Colour, which is an important facet of nature, influences the life of almost every creature. 
Câu 5: I think my hair looks fine. My mother believes it needs a little more brushing. 


A. Not only do I think my hair looks fine, but my mother also believes it needs a little more brushing.


B. Either my mother believes it needs a little more brushing or I think my hair looks fine.


C. I think my hair looks so fine that my mother believes it needs a little more brushing. 


D. I think my hair looks fine, but my mother believes it needs a little more brushing.

A.
B.
C.
D.

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