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1、2021GRE考试考前冲刺卷（6）本卷共分为2大题50小题，作答时间为180分钟，总分100分，60分及格。一、单项选择题（共25题，每题2分。每题的备选项中，只有一个最符合题意） 1. This section includes three types of questions: Quantitative Comparison, Discrete Problem Solving, and Numeric Entry. For each question, circle the letter of your choice or write your answer as instructed.
2、Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater;
3、 Cif the two quantities are equal; Dif you cannot determine the relationship based on the given information 2. Around the world, the bicycle is a favorite method of transportation, especiallyLine in China. With its large urban population, China ranks first in the world in bicycle production and use.
4、 In fact, China is responsible for half of the worlds bike ownership, with 10 million bicycles found in Beijing alone. This amounts (5) to about one bicycle for every two residents, and makes cycling the most popular form of transportation in the capital. However, as economic prosperity has increase
5、d, individual car ownership has also risen. This shift has contributed to already serious problems with urban pollution and traffic congestion. As a result, the government has encouraged even (10) more bicycle use. Bike lanes have been added to city streets, and more bicycle parking lots have been c
6、reated throughout Beijing. Still, critics point out that cars are much more convenient for many daily activities in a large city. Only time will tell if government measures will ensure that bicycles remain the favorite method of transportation.The author implies that car ownership in China is on the
7、 rise because A(A) bicycles are seen as old-fashionedB(B) Beijing air pollution makes cycling too difficultC(C) there are now more wealthy Chinese able to purchase carsD(D) bicycles are easier to maneuver on busy streetsE(E) government measures to increase bicycle use have been largely unsuccessful
8、3. All mammals require sleep; it is an essential part of life. For giraffes, two hours aLine day is enough. For bats, that number is closer to twenty. The average adult human needs between seven and nine hours of sleep every day. Despite these differences, mammals all have one thing in common: If th
9、ey do not get enough sleep, they can (5) suffer serious mental and physical consequences. The most extensive sleep research has been conducted on people. Through these studies, scientists have identified two broad categories of sleep, which can be further divided into five stages with distinct physi
10、ological functions. Taken together, they form a complete sleep cycle. The first four stages are marked by a (30) lack of rapid eye movement (REM). Therefore, they are referred to as non-REM sleep. While people are engaged in non-REM sleep, several things are occurring. Researchers have discovered th
11、at during this early sleep, the human body releases a series of hormones responsible for the proper functioning of certain body systems. Disrupted sleep can cause these hormones to fall out of balance. (15) The results can contribute to disorders such as diabetes, depression, infertility, or even ca
12、ncer. Lack of sleep, especially in stages 3 and 4, can literally stunt the growth of children and may increase rates of obesity in adults. Stage 5 sleep is defined by the occurrence of rapid eye movement, otherwise known as dreaming. Note that, while REM sleep is the final stage in a sleep cycle, (2
13、0) a complete cycle generally lasts only about 95 minutes. A person will experience four to six cycles in one sleep session, with REM sleep taking up a larger portion of the cycle as the night continues. Scientists have advanced several theories about why humans need REM sleep. One view is that drea
14、ming aids in memory consolidation. Under this theory, during REM sleep the brain not only strengthens (25) memory of important actions or events, but it weakens memory of unimportant things. Another view is that dreaming is necessary for proper central nervous system development. Yet another theory
15、suggests that REM sleep involves the repair of monoamine receptors. The theories are not necessarily exclusive; in fact, they all reach the conclusion that REM sleep deprivation can result in death.The author implies that disrupted sleep can cause disorders such as diabetes (line 15) because A(A) di
16、abetes is linked to obesityB(B) sufficient sleep is not crucial to good healthC(C) diabetes is a serious physical consequence of poor sleepD(D) the disorders are probably a result of unbalanced hormone productionE(E) non-REM sleep is more important than REM sleep 4. Directions for Quantitative Compa
17、rison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal
18、; Dif you cannot determine the relationship based on the given information 5. Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices: Aif
19、 the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal; Dif you cannot determine the relationship based on the given information 6. This section includes three types of questions: Quantitative Comparison, Discrete Problem Solving, and Numeric
20、Entry. For each question, circle the letter of your choice or write your answer as instructed. Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following an
21、swer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal; Dif you cannot determine the relationship based on the given information 7. Which of the following represents the ratio of the hours teenagers spend on Work/School to the
22、 hours teenagers spend on all activitiesA(A) 17:24B(B) 7:17C(C) 7:24D(D) 24:17E(E) 24:7 8. All mammals require sleep; it is an essential part of life. For giraffes, two hours aLine day is enough. For bats, that number is closer to twenty. The average adult human needs between seven and nine hours of
23、 sleep every day. Despite these differences, mammals all have one thing in common: If they do not get enough sleep, they can (5) suffer serious mental and physical consequences. The most extensive sleep research has been conducted on people. Through these studies, scientists have identified two broa
24、d categories of sleep, which can be further divided into five stages with distinct physiological functions. Taken together, they form a complete sleep cycle. The first four stages are marked by a (30) lack of rapid eye movement (REM). Therefore, they are referred to as non-REM sleep. While people ar
25、e engaged in non-REM sleep, several things are occurring. Researchers have discovered that during this early sleep, the human body releases a series of hormones responsible for the proper functioning of certain body systems. Disrupted sleep can cause these hormones to fall out of balance. (15) The r
26、esults can contribute to disorders such as diabetes, depression, infertility, or even cancer. Lack of sleep, especially in stages 3 and 4, can literally stunt the growth of children and may increase rates of obesity in adults. Stage 5 sleep is defined by the occurrence of rapid eye movement, otherwi
27、se known as dreaming. Note that, while REM sleep is the final stage in a sleep cycle, (20) a complete cycle generally lasts only about 95 minutes. A person will experience four to six cycles in one sleep session, with REM sleep taking up a larger portion of the cycle as the night continues. Scientis
28、ts have advanced several theories about why humans need REM sleep. One view is that dreaming aids in memory consolidation. Under this theory, during REM sleep the brain not only strengthens (25) memory of important actions or events, but it weakens memory of unimportant things. Another view is that
29、dreaming is necessary for proper central nervous system development. Yet another theory suggests that REM sleep involves the repair of monoamine receptors. The theories are not necessarily exclusive; in fact, they all reach the conclusion that REM sleep deprivation can result in death.The passage su
30、ggests that the author would be most likely to agree with which of the following statements A(A) A typical person needs more than six sleep cycles to maintain optimal health.B(B) REM sleep is more important than non-REM sleep.C(C) A typical person experiences more REM sleep at the end of the night.D
31、(D) Lack of sleep can stunt the growth of adults.E(E) The majority of sleep disorders occur in children. 9. Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the
32、 following answer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal; Dif you cannot determine the relationship based on the given information 10. This section includes three types of questions: Quantitative Comparison, Discret
33、e Problem Solving, and Numeric Entry. For each question, circle the letter of your choice or write your answer as instructed. Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and
34、 choose one of the following answer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal; Dif you cannot determine the relationship based on the given information 11. Directions for Quantitative Comparison Questions: Some of the
35、following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices: Aif the quantity in Column A is greater; Bif the quantity in column B is greater; Cif the two quantities are equal; Dif you cannot determine th
36、e relationship based on the given information 12. All mammals require sleep; it is an essential part of life. For giraffes, two hours aLine day is enough. For bats, that number is closer to twenty. The average adult human needs between seven and nine hours of sleep every day. Despite these differenc
37、es, mammals all have one thing in common: If they do not get enough sleep, they can (5) suffer serious mental and physical consequences. The most extensive sleep research has been conducted on people. Through these studies, scientists have identified two broad categories of sleep, which can be furth
38、er divided into five stages with distinct physiological functions. Taken together, they form a complete sleep cycle. The first four stages are marked by a (30) lack of rapid eye movement (REM). Therefore, they are referred to as non-REM sleep. While people are engaged in non-REM sleep, several thing
39、s are occurring. Researchers have discovered that during this early sleep, the human body releases a series of hormones responsible for the proper functioning of certain body systems. Disrupted sleep can cause these hormones to fall out of balance. (15) The results can contribute to disorders such a
40、s diabetes, depression, infertility, or even cancer. Lack of sleep, especially in stages 3 and 4, can literally stunt the growth of children and may increase rates of obesity in adults. Stage 5 sleep is defined by the occurrence of rapid eye movement, otherwise known as dreaming. Note that, while RE
41、M sleep is the final stage in a sleep cycle, (20) a complete cycle generally lasts only about 95 minutes. A person will experience four to six cycles in one sleep session, with REM sleep taking up a larger portion of the cycle as the night continues. Scientists have advanced several theories about w
42、hy humans need REM sleep. One view is that dreaming aids in memory consolidation. Under this theory, during REM sleep the brain not only strengthens (25) memory of important actions or events, but it weakens memory of unimportant things. Another view is that dreaming is necessary for proper central
43、nervous system development. Yet another theory suggests that REM sleep involves the repair of monoamine receptors. The theories are not necessarily exclusive; in fact, they all reach the conclusion that REM sleep deprivation can result in death.The authors argument is developed primarily by the use
44、of A(A) an attack on poorly constructed sleep research studiesB(B) a critique of recent scientific studies on REM-sleepC(C) a warning against getting too little sleepD(D) an analogy between human and non-human sleep processesE(E) an overview of specific processes that may occur during different stag
45、es of sleep in humans 13. Refer to the following graphs for Questions. What was the approximate average yearly increase in the cost of wool from 1996 to 2000, inclusive A(A) $1,250B(B) $2,000C(C) $3,300D(D) $5,0O0E(E) $10,000 14. Refer to the following graphs for Questions. Approximately what percen
46、t of textile imports in 1991 came from cotton A(A) 18%B(B) 25%C(C) 28%D(D) 35%E(E) 40% 15. All mammals require sleep; it is an essential part of life. For giraffes, two hours aLine day is enough. For bats, that number is closer to twenty. The average adult human needs between seven and nine hours of sle