问答

1答疑

[Reading Comprehension]

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文章：

Line Micro-wear patterns found on the teeth of long-
extinct specimens of the primate species
australopithecine may provide evidence about their
diets. For example, on the basis of tooth micro-wear
(5) patterns, Walker dismisses Jolly’s hypothesis that
australopithecines ate hard seeds. He also disputes
Szalay’s suggestion that the heavy enamel of
australopithecine teeth is an adaptation to bone
crunching, since both seed cracking and bone
(10) crunching produce distinctive micro-wear
characteristics on teeth. His conclusion that
australopithecines were frugivores (fruit eaters) is
based upon his observation that the tooth micro-
wear characteristics of east African
(15) australopithecine specimens are indistinguishable
from those of chimpanzees and orangutans, which
are commonly assumed to be frugivorous primates.
However, research on the diets of
contemporary primates suggests that micro-wear
(20) studies may have limited utility in determining the
foods that are actually eaten. For example, insect
eating, which can cause distinct micro-wear
patterns, would not cause much tooth abrasion in
modern baboons, who eat only soft-bodied insects
(25) rather than hard-bodied insects. In addition, the
diets of current omnivorous primates vary
considerably depending on the environments that
different groups within a primate species inhabit; if
australopithecines were omnivores too, we might
(30) expect to find considerable population variation in
their tooth micro-wear patterns. Thus, Walker’s
description of possible australopithecine diets may
need to be expanded to include a much more
diverse diet.

题目：

It can be inferred from the passage that if studies of tooth micro-wear patterns were conducted on modern baboons, which of the following would most likely be true of the results obtained?

选项:

答案:

D
1答疑

[Problem Solving]

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题目：

A photography dealer ordered 60 Model X cameras to be sold for $250 each, which represents a 20 percent markup over the dealer’s initial cost for each camera. Of the cameras ordered, 6 were never sold and were returned to the manufacturer for a refund of 50 percent of the dealer’s initial cost. What was the dealer’s approximate profit or loss as a percent of the dealer’s initial cost for the 60 cameras?

选项:

A、7% loss
B、13% loss
C、7% profit
D、13% profit
E、15% profit

答案:

D
1答疑

[Critical Reasoning]

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题目：

Astronomer: Most stars are born in groups of thousands, each star in a group forming from the same parent cloud of gas. Each cloud has a unique, homogeneous chemical composition. Therefore, whenever two stars have the same chemical composition as each other, they must have originated from the same cloud of gas.

Which of the following, if true, would most strengthen the astronomer’s argument?

选项:

A、In some groups of stars, not every star originated from the same parent cloud of gas.
B、Clouds of gas of similar or identical chemical composition may be remote from each other.
C、Whenever a star forms, it inherits the chemical composition of its parent cloud of gas.
D、Many stars in vastly different parts of the universe are quite similar in their chemical compositions.
E、Astronomers can at least sometimes precisely determine whether a star has the same chemical composition as its parent cloud of gas.

答案:

C
1答疑

[Reading Comprehension]

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文章：

题目：

It can be inferred from the passage that the isotope record taken from ocean sediments would be less useful to researchers if which of the following were true?

选项:

A、It indicated that lighter isotopes of oxygen predominated at certain times.
B、It had far more gaps in its sequence than the record taken from rocks on land.
C、It indicated that climate shifts did not occur every 100,000 years.
D、It indicated that the ratios of oxygen 16 and oxygen 18 in ocean water were not consistent with those found in fresh water.
E、It stretched back for only a million years.

答案:

B
1答疑

[Critical Reasoning]

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文章：

It is true of both men and women that those who marry as young adults live longer than those who never marry. This does not show that marriage causes people to live longer, since, as compared with other people of the same age, young adults who are about to get married have fewer of the unhealthy habits that can cause a person to have a shorter life, most notably smoking and immoderate drinking of alcohol.

题目：

Which of the following, if true, most strengthens the argument above?

选项:

A、Marriage tends to cause people to engage less regularly in sports that involve risk of bodily harm. A married person who has an unhealthy habit is more likely to give up that habit than a person with the same habit who is unmarried
B、A person who smokes is much more likely than a nonsmoker to marry a person who smokes at the time of marriage, and the same is true for people who drink alcohol immoderately. 
C、Among people who marry as young adults, most of those who give up an unhealthy habit after marriage do not resume the habit later in life. 
D、Among people who as young adults neither drink alcohol immoderately nor smoke, those who never marry live as long as those who marry

答案:

E
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[Critical Reasoning]

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题目：

Which of the following, if true, most logically completes the argument?
Psychologist: Although studies of young children have revealed important facts about the influence of the environment on language acquisition , it is clear that one cannot attribute such acquisition solely to environmental influences: innate mechanisms also play a role. So, the most reasonable question that ought to be studies is whether__________.

选项:

A、language acquisition can ever be fully explained
B、innate mechanisms are a contributing factor in language learning
C、language acquisition is solely the product of innate mechanisms
D、parents and peers are the most important influence on a child's learning of a language
E、innate mechanisms play a more important role in language acquisition than a child's immediate environment

答案:

E
1答疑

[Data Sufficiency]

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题目：

For any integers x  and y , min(x , y  ) and max(x , y  ) denote the minimum and the maximum of x  and y  , respectively. For example, min(5, 2) = 2 and max(5, 2) = 5.  For the integer  w  , what is the value of min(10, w  ) ?
(1)   w  = max(20, z  ) for some integer z.
(2)   w  = max(10, w  )

选项:

答案:

D
1答疑

[Reading Comprehension]

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题目：

It can be inferred from the passage that the author of the passage considers Allen's "discovery" (see highlighted text) to be

选项:

A、 already known to earlier historians
B、 based on a logical fallacy
C、 improbable but nevertheless convincing
D、 an unexplained, isolated fact
E、 a new, insightful observation

答案:

D
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[Sentence Correction]

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题目：

Early administrative decisions in China's Ming Dynasty eventually caused a drastic fall in tax revenues, a reduction in military preparedness, the collapse of the currency system, and failed to make sufficient investment in vital transportation infrastructure.

选项:

A、
A. the collapse of the currency system, and failed
B、
B. the collapse of the currency system, and failing
C、
C. and the collapse of the currency system, also failed
D、
D. the collapse of the currency system, as well as failing
E、
E. and the collapse of the currency system, as well as a failure

答案:

E
1答疑

[Sentence Correction]

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题目：

Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

选项:

A、
A. the freshwater snails that are the parasite's hosts for part of its life cycle
B、
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C、
C. freshwater snails which become the parasite's hosts for part of its life cycles
D、
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E、
E. parasite's hosts, freshwater snails which become their hosts during their life cycles

答案:

A
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1145浏览

[Undefined]

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Art historian: Unlike many artistic traditions that sought to depict plants native to the local area in a seasonally appropriate way (for example, depicting scenes of spring with the plants in the appropriate stages of development for that season), seventeenth-century Dutch artists specializing in flower paintings almost exclusively chose to depict exotic species of flowers from outside the local area. Painting such species was worthwhile primarily because the art-buying public had developed a strong preference for images of the exotic. The great botanical centers of the time gave the artists direct access to such flowers, which the artists would freely combine in a single painting, regardless of whether the combined species occurred together in the wild, and depicted each in full bloom, regardless of whether those species bloomed at the same time in nature.

Statement: The art historian makes the point that the species of flowers these Dutch artists chose to paint were 1 largely because the species were 2 .

Select for 1 and for 2 the options that complete the statement so that it is most strongly supported by the information provided. Make only two selections, one in each column.
我选的CE，和EC有什么区别？怎么选出EC的？
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3269浏览

[Undefined]

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An unusually severe winter occurred in Europe after the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the European republic of Iceland in the summer of 1984.  Thus, it is evident that major eruptions cause the atmosphere to become cooler than it would be otherwise.
Which of the following statements, if true, most seriously weakens the argument above?
C选项为什么就不会有张冠李戴的问题呢，1984和1982的气候情况能一样吗，C里的火山就可以试用于原文的火山吗
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3624浏览

[Undefined]

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The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
为什么这个题一定是相乘不能是相加呢？y=k1A方-k2B （k1,k2大于0 ），也满足题目说的与A方成正比与B成反比啊？但是这道题只有相乘的情况才能选出正确答案
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1202浏览

[Undefined]

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Tiger beetles are such fast runners that they can capture virtually any nonflying insect.  However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack.  Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
 
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?
答案C是怎么支持一个猜想又削弱另一个猜想的？
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2757浏览

[GWD]

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The author of the passage implies that which of the following is a possible partial explanation for acquisition behavior during the 1970's and 1980's?
请解释这道题为什么不选C或E，除了正确选项B，我认为文中也正确地提到了这两个选项可以解释acquisition behavior during 1970s and 80s
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1897浏览

[OG]

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The primary purpose of the passage is to
为什么选E不选B
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1215浏览

[Undefined]

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Club X has more than 10 but fewer than 40 members. Sometimes the members sit at tables with 3 members at one table and 4 members at each of the other tables, and sometimes they sit at tables with 3 members at one table and 5 members at each of the other tables. If they sit at tables with 6 members at each table except one and fewer than 6 members at that one table, how many members will be at the table that has fewer than 6 members?
提问小梅老师 这道题求讲一下 我没什么思路 带入数字得的是3
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1278浏览

[Undefined]

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A photography dealer ordered 60 Model X cameras to be sold for $250 each, which represents a 20 percent markup over the dealer's initial cost for each camera. Of the cameras ordered, 6 were never sold and were returned to the manufacturer for a refund of 50 percent of the dealer's initial cost. What was the dealer's approximate profit or loss as a percent of the dealer's initial cost for the 60 cameras?
请问小梅老师 这道题讲讲一下 我算的是19% 原来成本是200每个 亏了6个 每个亏100. 最后得不出答案
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303376浏览

[Undefined]

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Analytical!
请问may老师，这题该用什么思路来做？
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310503浏览

[Undefined]

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Analytical!
请问张老师，这道题为什么D不对？我有我觉得second paragraph最后一句话特别指向D
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