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GWD The author's explanation of how deep events occur would be most weakened if which of the following were discovered to be true?
Ready4 <p>Running at their respective constant rates, Machine A takes 4 days longer to produce n widgets than Machine B. At these rates, if the two machines together produce widgets in 3 days, how many days would it take Machine A alone to produce widgets?p>
Ready4 <p>Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 10, 0.23, and 8.107 are three terminating decimals. If n and m are positive integers and the ratio n m is expressed as a decimal, is n m a terminating decimal?p>
  1. n is a three-digit number divisible by 10.
  2. m=5
Ready4 <p>If ⌊ n ⌋ indicates the greatest integer less than or equal to n, is ⌊ n ⌋=0 ?p>
  1. 1 2 > n 2 >− 1 2
  2. n<0
Ready4 <p class="ng-scope">     Scientists have long known that two brain structures lying below the rostrum of the corpus callosum, called septal nuclei (SNs), play a significant role in human pleasure response. This part of the brain interacts with many other elements of the limbic system, which regulates fear expression and other forms of emotional response. Studies show that in some animals, most notably rats, electrical stimulation of SNs can motivate self-stimulation, causing them to perform such behaviors as manipulating levers or returning to regions of their housing that administer further electrical stimulation. Furthermore, connections between the SNs and portions of the brain dedicated to olfaction and memory retention have also been discovered.p> <p class="ng-scope">     Several other neural structures have been found to play a role in governing the brain's emotional responses, however, not just the SNs of rats and humans. In fact, when laboratory rats had electrical stimulation applied to their habenular nuclei, pleasure responses shifted by 30 percent, whereas the same electrical shock applied to the SNs produced a lesser result. While scientists remain convinced that SNs play a role in the brain's regulation of fear, sadness, joy, and pleasure response, scientists now believe that other neural structures may respond more forcefully to stimulation—even if the voltage of the shock administered doesn't change—than the septal nuclei.p>
191031
Two sqaures both are 10x10. Is the shaded area 25?
(1)P is on the diagonal line of ABCD
(2)CD and PQ is perpendicular
应用题 If $5,000 invested for one year at p percent simple annual interest yields $500, what amount must be invested at k percent simple annual interest for one year to yield the same number of dollars?(1) k = 0.8p(2) k = 8
Ready4 <p class="ng-scope">      Despite views that globalization has reached its peak, a period beginning in the nineteenth century and extending into the early-twentieth century, in fact, is the interval during which international barriers to trade fell most steeply, as can be seen in the case of price convergence in commodities. The prices of cloves, pepper, and coffee failed to converge between Amsterdam and East Asia or between England and India from as far back as 1580 but began in 1820 to draw closer. Similarly, the difference in wheat prices in the United States and England fell from one hundred percent in the early-nineteenth century to negligible levels late in the century and to no difference at all in the early-twentieth century. A similar story unfolded during this period for bacon, cotton, and rice.p> <p class="ng-scope">     Peter Lindert and Jeffrey Williamson have summarized the price gaps in commodity markets between continents as evolving in three phases. From 1820 to 1914, these gaps fell by 81 percent; they attribute 72 percent of this decline to cheaper transport and 28 percent to trade policies. Second, during the wartime period of 1914 to 1950, the gaps doubled, due to a reversal in trade policies. Finally, from 1950 to 2000, they fell again by 76 percent, ending up 92 percent lower than in 1820, with about four-fifths of the total change attributable to cheaper transport and one-fifth to more favorable trade policies.p> <p class="ng-scope">     Trade data for this period are typically articulated in terms of ratio of total trade volume to gross domestic product, since commodity price information is not universally available. These ratios in many advanced economies were higher in the mid-1990s than in the early 1900s, but not by much. In Japan, notably, the percentage of GDP for which trade accounted in 1995 was 17 percent, far under its 1910 level of 30 percent, as measured in current prices. Sure enough, the ratios have risen somewhat in other economies over that same time period—by 13 percentage points in the United Kingdom, 8 points in France, and from 11 percent to 24 percent in the United States; this latter spike may explain why the attention to globalization has been especially acute in America. These increases, nevertheless, are modest given the fact that the world economy grew roughly twice as quickly in the twentieth century as in the nineteenth.p> <p class="ng-scope">     The ratios above, and hence the substantiation for the argument that globalization peaked a century ago, grow much more dramatically if they are computed in constant prices rather than in current prices, because the prices of goods relative to services fell due to sustained increases in productivity in the sectors producing these goods. Trade has grown most in those sectors in which prices have most strikingly fallen, so the proportions of GDP in constant prices have risen more than those in current prices.p>
C13 <p class="ng-scope">When Medgar Evers applied to the then-segregated University of Mississippi Law School in February 1954, he did so at a crucial moment in American history. Three months later, in May, the Supreme Court’s landmark decision in Brown v. Board of Education struck down state-sponsored segregation, stating that "separate educational facilities are inherently unequal." The school’s refusal to admit Evers drew the interest of the NAACP and ultimately became the epicenter of its historic campaign to desegregate the school.p> <p class="ng-scope">The Brown v. Board of Education ruling paved the way for integration and was a major victory for the civil rights movement, but the South was not ready to accept the change. The state governments of Texas, Arkansas, Florida and Alabama actively fought the decision, with some politicians physically blocking African American students’ entry into high schools and universities, moving aside only when confronted with military officers sent by the federal government to enforce the law. The entrenched racism of the South came into conflict with the rest of the country, creating a sense for African Americans that they would have to fight for the rights that had, legally, already been granted to them.p> <p class="ng-scope">Evers was an active public figure, conducting well-publicized investigations into race-based injustices being perpetrated in the South, such as the unprosecuted murder of fourteen-year-old Emmett Till. This limelight brought numerous death threats and attempts on his life. On June 12, 1963, just hours after President John F. Kennedy's historic Civil Rights Address, Evers was shot in the back outside his home by a white supremacist. While his death was undoubtedly a tragic loss, some scholars have suggested that it galvanized the African American community, giving many members renewed motivation to carry on Evers’s crusade. His murder was a rallying cry for those who supported civil rights in the U.S., and his legacy continues to lend strength to the ongoing campaign for racial equality.p>
Ready4 <p class="ng-scope">When Medgar Evers applied to the then-segregated University of Mississippi Law School in February 1954, he did so at a crucial moment in American history. Three months later, in May, the Supreme Court’s landmark decision in Brown v. Board of Education struck down state-sponsored segregation, stating that "separate educational facilities are inherently unequal." The school’s refusal to admit Evers drew the interest of the NAACP and ultimately became the epicenter of its historic campaign to desegregate the school.p> <p class="ng-scope">The Brown v. Board of Education ruling paved the way for integration and was a major victory for the civil rights movement, but the South was not ready to accept the change. The state governments of Texas, Arkansas, Florida and Alabama actively fought the decision, with some politicians physically blocking African American students’ entry into high schools and universities, moving aside only when confronted with military officers sent by the federal government to enforce the law. The entrenched racism of the South came into conflict with the rest of the country, creating a sense for African Americans that they would have to fight for the rights that had, legally, already been granted to them.p> <p class="ng-scope">Evers was an active public figure, conducting well-publicized investigations into race-based injustices being perpetrated in the South, such as the unprosecuted murder of fourteen-year-old Emmett Till. This limelight brought numerous death threats and attempts on his life. On June 12, 1963, just hours after President John F. Kennedy's historic Civil Rights Address, Evers was shot in the back outside his home by a white supremacist. While his death was undoubtedly a tragic loss, some scholars have suggested that it galvanized the African American community, giving many members renewed motivation to carry on Evers’s crusade. His murder was a rallying cry for those who supported civil rights in the U.S., and his legacy continues to lend strength to the ongoing campaign for racial equality.p>
Ready4 <p class="ng-scope">     In semi-aquatic ecosystems, bodies of water present peculiar difficulties for the hunting strategies of spiders. Ponds, lakes, and rivers can provide unnavigable escape vectors for prey organisms, making it likely that predators will lose out on valuable nutritional resources. The water spider Dolomedes, in particular, demonstrates adaptations that allow it to take advantage of waterborne food sources.p> <p class="ng-scope">     The difficulty that members of the species Dolomedes face is best evidenced by the typical hunting strategies of terrestrial spiders. All spiders produce silk and arboreal species generally spin their silk into fine, latticework structures that they suspend in the environment to trap passing arthropods, which entangle themselves due to the exigencies of the forested ecosystem. In environs lacking tree coverage or comparable large structures, however, web-hunting becomes inefficient, and other strategies of predation have to be pursued. That many spider species persist in environments lacking significant tree coverage suggests that certain behavioral adaptations enable them to locate food effectively in a variety of environmental circumstances.p> <p class="ng-scope">     One such adaptation is the proactive use of water bodies by Dolomedes, who eschew silk in favor of water tension, which they use to monitor the movements of prey animals. Organisms fall into a pond, lake, or river, and send waves vibrating from the point of impact across the surface of the pool. Dolomedes uses these vibrations to locate and capture the fallen organism. For arboreal spiders, who can only monitor the vibrations caused by insects caught in the webs they've spun, this is useless information. Such a hunting strategy does not require that the arboreal spiders pay attention to extraneous prey when other prey is acquired in abundance by other adaptations. In comparison, Dolomedes acquires its prey by yet another aquatic adaptation, using a coat of tiny, hydrophobic hairs that allow the spider to submerge itself in the liquid environment. By causing a pocket of air to gather and surround the surface of the spider's body, these hairs allow Dolomedes to submerge itself in water, thus giving it access to sources of prey closed off to other species.p>
Magoosh GMAT、gmat题库、gmat模考、gmat考满分In the diagram, JKLM is a square, and P is the midpoint of KL. Is JQM an equilateral triangle?Statement #1: ∠KPQ = 90°Statement #2: ∠JQP = 150°
Ready4
  W X Y Z
W 0 83 45 y
X 83 0 b 43
Y 45 b 0 a
Z y 43 a 0
<p>The table above shows the distance, in miles, by the most direct route between any two of the four cities W, X, Y, and Z. For example, the distance between City W and City X is 83 miles. What is the value of a?p> <p>(1) By the most direct route, the distance between W and X is one-third of the distance between Y and Z.p> <p>(2) By the most direct route, the distance between W and Y is four times the distance between X and Y.p>
Ready4 <p style="text-align: center;">p><p>In the xy-plane shown, the shaded region consists of all points that lie above the graph of y=x^2-10x and below the x-axis. Does the point (n,<font color='#FE8080'>p</font>) (not shown) lie in the shaded region if ?p> <p>(1) p> <p>(2) p>
C13 <p class="ng-scope" zoompage-fontsize="14">     Koltsov predicted in 1927 that an organism's inherited traits are determined by gradual changes in a “giant hereditary molecule,” later known as DNA, that is the building block of the genome that determines an organism's genetic makeup. This hypothesis was unproven, for a time, because of limitations in experimental methodology and an inability to do much more than observe qualities of an organism's DNA compared to the traits it expressed.p> <p class="ng-scope" zoompage-fontsize="14">     To determine the nature of the connection between DNA and heritable characteristics, scientists needed to be able to bring about changes in the genome and observe whether they corresponded to physical changes in the organism. An experiment conducted by Zimmer in 1935 indicated that this was possible: radiation applied to living tissue can change the structures of DNA and another nucleic acid, RNA, that are found in the cells of every organism. Most of the exposed molecules go unchanged in this experiment, but some of them respond to experimental pressures. When X-rays are applied to cells, the nucleic acids warp and rearrange themselves, sometimes dramatically altering the traits they cause the organism to express. Because the changes induced by radiation exposure are more rapid and intense than those brought about by natural selection, significantly altered heritable traits can be observed in a single generation.p> <p class="ng-scope" zoompage-fontsize="14">    As a proof of the connection between DNA and heritable characteristics, radiation experiments have two advantages. First, they are universally applicable: the genome of any organism responds to radiation exposure in a way comparable to any other organism. Second, it is a more direct means of genetic intervention than other methods like selective breeding. These advantages mean that radiation experiments can be used to isolate the hereditary influence of DNA from other confounding variables. The results of these experiments demonstrate that DNA exerts a substantial influence on the hereditary characteristics organisms express: DNA is the way that organisms transfer heritable traits between generations. These experiments have established an unassailable connection between intergenerational biological change and the information contained within the building blocks of the genome.p> <p class="ng-scope" zoompage-fontsize="14">    However, it is important to note that there are other biological mechanisms, such as epigenetics and certain environmental pressures, that also affect the expression of inherited characteristics. The advantage of the Koltsov theory is its broad applicability; DNA is present in every organism on earth, which is not true of the various other factors that might have a role to play in determining the expression of heritable characteristics. That said, the comparative immeasurability of these other potential influences does not make them unworthy of study.p>
Ready4 <p>In the xy-plane, region R consists of all the points (x,y) such that 5x+6y≤30. Is the point (r,s) in region R?p>
  1. 6r+5s=30
  2. r≤6 and s≤5.
PREP07 Test 1 What is the total value of Company H's stock?(1) Investor P owns 1/4 of the shares of Company H's total stock.(2) The total value of Investor Q's shares of Company H's stock is $16,000.
Ready4 Three machines K, M, and P, working simultaneously and independently at their respective constant rates, can complete a certain task in 24 minutes. How long does it take Machine K, working alone at its constant rate, to complete the task?
190124 还原机经选题: 文字题&amp;几何 The center of circle O is the coordinate origin. The radius of the circle is 50.p($$x_p$$,$$y_p$$) and Q(50,0) are all on the circle. What is the distance of PQ? 1：$$x_p$$=-30 2：$$y_p$$=-40
OG18-数学分册 GMAT、gmat题库、gmat模考、gmat考满分In the rectangular coordinate system above, if $$\bigtriangleup$$ OPQ and $$\bigtriangleup$$ QRS have equal area, what are the coorddinates of point R?(1) The coordinates of point P are (0,12).(2) OP = OQ and QS = RS.