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OG21 OG2022
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Although when a hagfish is threatened, it will secrete slime that is small in quantity, it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.
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OG21 OG2022
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Officials at the United States Mint believe that the Sacagawea dollar coin will be used more as a substitute for four quarters rather than for the dollar bill because of its weight, only 8.1 grams, which is far less than four quarters, which weigh 5.67 grams each.
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OG21 OG2022
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Scientists claim that the discovery of the first authenticated mammal bones in amber could provide important clues of determining, in addition to how, when mammals colorized the islands of the West Indies.
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OG21 OG2022
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The ages of tropical rain forest trees provide critical information for understanding the dynamics of tree populations, to determine historical patterns of disturbance, developing sustainable forestry practices, and calculating carbon recycling rates.
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OG21 OG2022
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Unlike historical evidence of weather patterns in other regions of the world, which scientists find abundantly represented in tree rings, ancient glacial ice, or layers of sediment from seasonal plankton, the North Pole's clues about its past climates are almost nonexistent.
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OG21
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Pretzel Vendor: The new license fee for operating a pretzel stand outside the art museum is prohibitively expensive Charging typical prices. I would need to sell an average of 25 pretzels per hour to break even. At my stand outside City Hall, with about as many passers-by as at the art museum, I average only 15 per hour. So I could not break even running a stand outside the art museum, much less turn a profit.
Which of the following, if true, most seriously weakens the pretzel vendor's argument?
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OG21 OG2022
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Highway Official: When resurfacing our concrete bridges, we should use electrically conductive concrete (ECC) rather than standard concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the deicing salt we currently use. Taxpayer: But ECC is vastly more expensive than standard concrete, so your proposal is probably not justifiable on economic grounds.
Which of the following, if true, could best be used by the highway official to support the official's proposal in the face of the taxpayer's objection?
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OG21 OG2022
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Brown tides are growths of algae on the sea's surface that prevent sunlight from reaching marine plants below, thereby destroying not only the plants but also the shellfish that live off these plants. Biologists recently isolated a virus that, when added to seawater, kills the algae that cause brown tides. Adding large quantities of this virus to waters affected by brown tides will therefore make it possible to save the populations of shellfish that inhabit those waters.
Which of the following, if true, provides the most support for the conclusion of the argument?
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OG21 OG2022
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In persons with astigmatism, the clear outer layer of the eye is deformed in a way that impairs and sometimes distorts vision. The elongated figures in the paintings of El Greco (1541-1614) were so unusual that some critics sought to explain them by hypothesizing that without knowing it, El Greco had an astigmatism that caused everything to appear to him in the distorted way that
was characteristic of his painted figures.
The proposed explanation is most vulnerable to the criticism that it fails to
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OG21 OG2022
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Professor: A marine biologist argues that transmission of sea lice from farm salmon to wild salmon is unlikely in the Broughton Archipelago, British Columbia, citing numerous studies suggesting that salinities less than 30 parts per thousand are unfavorable to sea-lice survival. The biologist concludes that the archipelago's 25-30 parts per thousand salinity range between March and June, the critical period for wild salmon migration, tends to suppress sea-lice proliferation. But a review of the literature shows that salinities of 25-30 parts per thousand in combination with British Columbia's cool spring temperatures favor the flourishing of sea lice.
In this passage, the professor attempts to undermine the biologist's argument by
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OG21 OG2022
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In the 1960s, surveys of Florida's alligator population indicated that the population was dwindling rapidly. Hunting alligators was banned. By the early 1990s, the alligator population had recovered, and restricted hunting was allowed. Over the course of the 1990s, reports of alligators appearing on golf courses and lawns increased dramatically. Therefore, in spite of whatever alligator hunting went on, the alligator population must have increased significantly over the decade of the 1990s.
Which of the following, if true, most seriously weakens the argument?
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OG21 OG2022
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In an attempt to produce a coffee plant that would yield beans containing no caffeine. the synthesis of a substance known to be integral to the initial stages of caffeine production was blocked either in the beans, in the leaves, or both. For those plants in which synthesis of the substance was blocked only in the leaves. the resulting beans contained no caffeine.
Any of the following. if true, would provide the basis for an explanation of the observed results
EXCEPT:
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OG21 OG2022
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Which of the following most logically completes the passage?
Laminated glass is much harder to break than the glass typically used in the windows of cars driven in Relnia. It is more difficult for thieves to break into cars with laminated glass windows than into cars with ordinary glass windows, and laminated glass windows are less likely to break in a collision. Nevertheless, considerations of security and safety do not unambiguously support a proposal to require that in Relnia all glass installed in cars be laminated glass, since_________.
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OG21 OG20 OG2022
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There are 2 groups of students who took a history test. Was the average （arithmetic mean） score of the students in Group A higher than the average score of the students in Group B who took the test?
(1) Of the students who took the test, 10 were in Group A and 12 were in Group B.
(2) On the test, the highest score achieved was achieved by a Group B student and the lowest score achieved was achieved by a Group A student.
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OG21 OG2022
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If all of the six faces of a concrete block are rectangular, what is the volume of the block?
(1) Each of the four lateral faces of the block has an area of 200 square inches.
(2) The top of the block is square and has an area of 400 square inches.
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OG21 OG2022
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In the figure shown,is $$\ell1$$ || $$\ell2$$?
(1) r=s
(2) t=u
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OG21 OG2022
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What is the volume of the right circular cylinder X?
(1) The height of X is 20.
(2) The base of X has area 25π.
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模考带练机经题
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How many different prime factors does 2730 have?
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模考带练机经题
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According to the picture, a square whose width is x is inscribed in a circle. What is the area of the shaded part?
(1)shaded area =(π-2)x
(2)square area is 8x
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模考带练机经题
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There are three boys and three girls in a row. No girl can stand between boys, and no boy can stand between girls. How many different ways to stand in a line?
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