问答

1答疑

[Sentence Correction]

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题目：

Genetic engineering sometimes entails plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off insects or disease.

选项:

A、plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off
B、plant or animal genes that get spliced into the DNA of other species, either for improving crop yields or the warding off of
C、the splicing of plant or animal genes into other species' DNA, to either improve crop yields or to ward off
D、splicing plant or animal genes into the DNA of other species, either to improve crop yields or to ward off
E、splicing of plant or animal genes into the DNA of other species, for either the improvement of crop yields or to ward off

答案:

D
1答疑

[Critical Reasoning]

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题目：

The difficulty with the proposed high-speed train line is that a used plane can be bought for one-third the price of the train line, and the plane, which is just as fast, can fly anywhere. The train would be a fixed linear system, and we live in a world that is spreading out in all directions and in which consumers choose the free-wheel systems (cars, buses, aircraft), which do not have fixed routes. Thus a sufficient market for the train will not exist.

Which of the following, if true, most severely weakens the argument presented above?

选项:

A、Cars, buses, and planes require the efforts of drivers and pilots to guide them, whereas the train will be guided mechanically.
B、Cars and buses are not nearly as fast as the high-speed train will be.
C、Planes are not a free-wheel system because they can fly only between airports, which are less convenient for consumers than the high-speed train's stations would be.
D、The high-speed train line cannot use currently underutilized train stations in large cities.
E、For long trips, most people prefer to fly rather than to take ground-level transportation.

答案:

C
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[Problem Solving]

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题目：

The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenheit. If the temperature F of the coffee f minutes after it was poured can be determined by the formula F = 120(2-at) + 60, where F is in degrees Fahrenheit and a is a constant, then the temperature of the coffee 30 minutes after it was poured was how many degrees Fahrenheit?

选项:

A、65 
B、75 
C、80 
D、85 
E、90

答案:

B
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[Problem Solving]

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题目：

In x hours and y minutes a car traveled z miles. What is the car’s speed in miles per hour? 

选项:

A、z60+y
B、60z60+y
C、6060+y
D、zx+y
E、60+y60z

答案:

B
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[Data Sufficiency]

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题目：

If x , y , and z  are positive integers, is xz  even?
(1)   xy  is even.
(2)   yz  is even.

选项:

答案:

E
1答疑

[Argument Essay]

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题目：

Read the statement and the instructions that follow it,and then make any notes that will help you plan your response.Begin typing your response in the box at the bottom of the screen.
 
The following appeared as part of an article in a magazine on lifestyles.
 
"Tow years ago, City L was listed 14th in an annual survey that ranks cities according to the quality of life that can be enjoyed by those living in them. This information will enable people who are moving to the state in which City L is located to confidently identify one place, at least,
where schools are good, housing is affordable, people am friendly, the environment is safe, and the arts flourish."
Discuu how well reasoned . . . etc.

选项:

答案:

1答疑

[Sentence Correction]

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题目：

Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.

选项:

A、are visible as dark spots on the surface of the Sun but have never been sighted on
B、are visible as dark spots that never have been sighted on the surface of the Sun
C、appear on the surface of the Sun as dark spots although never sighted at
D、appear as dark spots on the surface of the Sun, although never having been sighted at
E、appear as dark spots on the Sun’s surface, which have never been sighted on

答案:

A
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[Critical Reasoning]

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题目：

Thyrian lawmaker: Thyria's Cheese Importation Board inspects all cheese shipments to Thyria and rejects shipments not meeting specified standards. Yet only 1 percent is ever rejected. Therefore, since the health consequences and associated economic costs of not rejecting that 1 percent are negligible, whereas the board's operating costs are considerable, for economic reasons alone the board should be disbanded.

Consultant: I disagree. The threat of having their shipments rejected deters many cheese exporters from shipping substandard product.

The consultant responds to the lawmaker's argument by

选项:

A、rejecting the lawmaker's argument while proposing that the standards according to which the board inspects imported cheese should be raised
B、providing evidence that the lawmaker's argument has significantly overestimated the cost of maintaining the board
C、objecting to the lawmaker's introducing into the discussion factors that are not strictly economic
D、pointing out a benefit of maintaining the board, which the lawmaker's argument has failed to consider
E、shifting the discussion from the argument at hand to an attack on the integrity of the cheese inspectors

答案:

D
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[Critical Reasoning]

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文章：

Manufacturers sometimes discount the price of a product to retailers for a promotion period when the product is advertised to consumers.Such promotions often result in a dramatic increase in amount of product sold by the manufacturers to retailers.Nevertheless.the manufacturers could often make more profit by not holding the promotions.

题目：

Which of the following, if true, most strongly supports the claim above about the manufacturers' profit?

选项:

A、The amount of discount generally offered by manufacturers to retailers is carefully calculated to represent the minimum needed to draw consumers' attention to the product. For many consumer products the period of advertising discounted prices to consumers is about a week.not sufficiently long for consumers to become used to the sale price. 
B、For products that are not newly introduced. the purpose of such promotions is to keep the products in the minds of consumers and to attract consumers who are currently using competing products. 
C、During such a promotion retailers tend to accumulate in their warehouses inventory bought at discount；they then sell much of it later at their regular price.
D、If a manufacturer fails to offer such promotions but its competitor offers them, that competitor will tend to attract consumers away from the manufacturer's product. 

答案:

D
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[Problem Solving]

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题目：

Note:  Figure not drawn to scale.

 
The figure above represents a square garden that is divided into 9 rectangular regions with indicated dimensions in meters.  The shaded regions are planted with peas, and the unshaded regions are planted with tomatoes.  If the sum of the areas of the regions planted with peas is equal to the sum of the areas of the regions planted with tomatoes, what is the value of x?

选项:

A、0.5
B、1
C、1.5
D、2
E、2.5

答案:

C
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334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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1290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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1467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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565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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1318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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941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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631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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637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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150896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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158004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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