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题目：

In recent years, networks of fiber-optic cable have been replacing electrical wire for transmitting telecommunications signals, Signals running through fiber-optic cables deteriorate, and wo the signals must be run through a piece of e3quiplent called a regenerator before being transmitted father. Light-Line is the leading manufacturer of signal regenerators. Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.
 
Which of the following, if true, casts the most doubt on the prediction about light-ling's prospects?

选项:

A、Telecommunications signals sent along electrical wires can travel much Farther than signals transmitted through fiber-optic before needing to be regenerated.
B、Expanding its production of regenerators will require Light-line to spend Proportionately more on labor and materials.
C、The volume of signals that a fiber-optic cable can carry is several Thousand timesgreater than the volume that can be carried by an electrical Wire of similar size.
D、There are technologies that enable telecommunications signals to be Transmitted without either wire or fiber-optic cable
E、 Several manufacturers are developing regenerator technologies that willow signals To be transmitted many times farther than at present before requiring regeneration

答案:

E
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题目：

Since the start of the space age, more and more littering has occurred in orbits near Earth, often because the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.

选项:

A、more and more littering has occurred in orbits near Earth, often because
B、orbits near Earth have become more and more littered, often from
C、orbits near Earth became littered more and more, often resulting from
D、there have been more and more littering of orbits near Earth, often because of
E、there had been littering more and more of orbits near Earth, often with

答案:

B
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题目：

Archaeologist: Researchers excavating a burial site in Cyprus found a feline skeleton lying near a human skeleton. Both skeletons were in the same sediment at the same depth and equally well-preserved, suggesting that the feline and human were buried together about 9,500 years ago. This shows that felines were domesticated around the time farming began, when they would have been useful in protecting stores of grain from mice.

Which of the following, if true, would most seriously weaken the archaeologist’s argument?

选项:

A、Archaeologists have not found any remains of stores of grain in the immediate vicinity of the burial site.
B、The burial site in Cyprus is substantially older than any other known burial site in which a feline skeleton and a human skeleton appear to have been buried together.
C、Paintings found near the burial site seem to show people keeping felines as domestic companions, but do not show felines hunting mice.
D、In Cyprus, there are many burial sites dating from around 9,500 years ago in which the remains of wild animals appear to have been buried alongside human remains.
E、Before felines were domesticated, early farmers had no effective way to protect stores of grain from mice.

答案:

D
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题目：

Normally a bone becomes fossilized through the action of groundwater, which permeates the bone, washes away its organic components, and replaces them with minerals.

选项:

A、which permeates the bone, washes away its organic components, and replaces them
B、which permeates the bone, washes away its organic components, and those are replaced
C、which permeates the bone, washing away its organic components, to be replaced
D、permeating the bone, washing away its organic components, to be replaced
E、permeating the bone, washing away its organic components and replacing them

答案:

A
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题目：

As sources of electrical power, windmills now account for only about 2,500 megawatts nationwide, but production is almost expected to double by the end of the year, which would provide enough electricity for 1.3 million households.

选项:

A、almost expected to double by the end of the year, which would provide
B、almost expected that it will double by the end of the year, thus providing
C、expected that it will almost double by the end of the year to provide
D、expected almost to double by the end of the year and thus to provide
E、expected almost to double by the end of the year, which would thus be providing

答案:

D
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题目：

At one time, the majestic American chestnut was so prevalent that it was said a squirrel could jump from tree to tree without once touching the ground between New York State and Georgia.
 

选项:

A、 so prevalent that it was said a squirrel could
B、 so prevalent that a squirrel was said that it could
C、 so prevalent for a squirrel to be said to be able to
D、 prevalent enough that it was said a squirrel could
E、 prevalent enough for a squirrel to be said to be able to

答案:

A
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In 1997, despite an economy that marked its sixth full year of uninterrupted expansion with the lowest jobless rate in a quarter century, the number of United States citizens declaring themselves bankrupt has jumped by almost 20 percent, at 1.34 million.

选项:

A、declaring themselves bankrupt has jumped by almost 20 percent, at
B、declaring themselves bankrupt jumped by almost 20 percent, to
C、who declared themselves bankrupt has jumped by almost 20 percent, to
D、who declared themselves bankrupt jumped almost by 20 percent, at
E、to declare themselves bankrupt jumped almost by 20 percent, at

答案:

B
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题目：

Using a criterion based on an object's color, astronomers recently identified 23 galaxies so distant from Earth that their light has taken 85 percent of the age of the universe to reach us.

选项:

A、astronomers recently identified 23 galaxies so distant from Earth that their light has taken
B、astronomers recently identified 23 galaxies that were so distant from Earth for their light to take
C、astronomers recently identified 23 galaxies to be so distant from Earth such that their light takes
D、23 galaxies were recently identified by astronomers to be so distant from Earth for their light to take
E、23 galaxies were recently identified by astronomers as so distant from Earth their light has taken

答案:

A
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题目：

A New York City ordinance of 1897 regulated the use of bicycles, mandated a maximum speed of eight miles an hour, required of cyclists to keep feet on pedals and hands on handlebars at all times, and it granted pedestrians right-of-way.

选项:

A、regulated the use of bicycles, mandated a maximum speed of eight miles an hour, required of cyclists to keep feet on pedals and hands on handlebars at all times, and it granted
B、regulated the use of bicycles, mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, granting
C、regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists that they keep feet on pedals and hands on handlebars at all times, and it granted
D、regulating the use of bicycles, mandating a maximum speed of eight miles an hour, requiring of cyclists that they keep feet on pedals and hands on handlebars at all times, and granted
E、regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, and granted

答案:

E
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题目：

Which of the following most logically completes the passage?
 
On the whole, scientists do their most creative work before age forty, a tendency that has been taken to show that aging carries with it a loss of creative capacity.  An alternative explanation is that by age forty most scientists have worked in their field for fifteen or more years and that by then they have exhausted the opportunity for creative work in that field.  Supporting this explanation is the finding that ______.

选项:

A、the average age of recipients of scientific research grants is significantly greater than forty
B、a disproportionately large number of the scientists who produce highly creative work beyond age forty entered their field at an older age than is common
C、many scientists temper their own expectations of what they can achieve in their research work by their belief that their creativity will decline as they age
D、scientists who are older than forty tend to find more satisfaction in other activities, such as teaching and mentoring, than they do in pursuing their own research
E、there is a similar diminution of creativity with age in nonscientific fields, such as poetry and musical composition

答案:

B
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[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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2511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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2750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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947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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2187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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[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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968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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1024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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[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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[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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