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300难题
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Suriland cannot both export wheat and keep bread plentiful and affordable in Suriland. Accordingly, Suriland's wheat farmers are required to sell their crop to the government, whichpays them a dollar per bushel less than the price on the world market. Therefore, if the farmers could sell their wheat on the world market, they would make a dollar per bushel more, less any additional transportation and brokerage costs they would have to pay.
Which of the following, if true, most seriously weakens the argument?
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300难题
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Banker: My country's laws require every bank to invest in its local community by lending money to local businesses, providing mortgages for local home purchases, and so forth. This is intended to revitalize impoverished local communities. But it is clear that the law will soon entirely cease to serve its intended purpose. An increasing number of banks incorporated in our country exist solely on the Internet and are not physically located in any specific community.
The banker's argument is most vulnerable to criticism on which of the following grounds?
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300难题
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A country's Aeronautics Board (AB) employs inspectors who make routine annual inspections of all aircraft. On inspecting Azura Airlines' airplanes in December, they reported considerably more violations of AB rules this year, compared to a year ago. This fact explains why Azura had more accidents this year, compared to last year.
Which of the following, if true, would cast most doubt on the conclusion in the passage?
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300难题
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Researchers in City X recently discovered low levels of several pharmaceutical drugs in public drinking water supplies. However, the researchers argued that the drugs in the water were not a significant public health hazard. They pointed out that the drug levels were so low that they could only be detected with the most recent technology, which suggested that the drugs may have already been present in the drinking water for decades, even though they have never had any discernible health effects.
Which of the following, if true, would most strengthen the researchers' reasoning?
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300难题
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Psychologist: In a survey, several hundred volunteers rated their own levels of self-control and their overall life satisfaction. The volunteers who rated themselves as having better self- control also reported greater satisfaction with their lives. This suggests that self-control is one factor that helps people avoid situations likely to produce dissatisfaction.
In order to assess the strength of the psychologist's argument, it would be most helpful to know whether
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300难题
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Beets and carrots are higher in sugar than many other vegetables. They are also high on the glycemic index, a scale that measures the rate at which a food increases blood sugar levels. But while nutritionists usually advise people to avoid high-sugar and high-glycemic-index foods, despite any nutritional benefits they may confer, they are not very concerned about the consumption of beets and carrots.
Which of the following, if true, would best explain the nutritionists' lack of concern?
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300难题
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The recycling of municipal solid waste is widely seen as an environmentally preferable alternative to the prevailing practices of incineration and of dumping in landfills. Recycling is profitable, as the recycling programs already in operation demonstrate. A state legislator proposes that communities should therefore be required to adopt recycling and to reach the target of recycling 50 percent of all solid waste within 5 years.
Which of the following, if true, most seriously calls into question the advisability of implementing the proposal?
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300难题
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Scientist: A greenhouse gas, for example, carbon dioxide, forms a transparent layer that traps solar heat beneath it in the earth's atmosphere. Atmospheric levels of carbon dioxide are currently increasing, causing the climate to warm-an effect that is predicted by at least one computer model of the greenhouse effect. But the warming that has occurred is a great deal less than what would be expected based on the model. Therefore, _______.
Which of the following most logically completes the scientist's argument?
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300难题
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Merle ' s spare change jar has exactly 16 U.S. coins, each of which is a 1-cent coin, a 5-cent coin, a 10-cent coin, a 25-cent coin, or a 50-cent coin. If the total value of the coins in the jar is 288 U.S. cents, how many 1-cent coins are in the jar?
1.The exact numbers of 10-cent,25-cent, and 50-cent coins among the 16 coins in the jar are, respectively, 6, 5,and 2.
2.Among the 16 coins in the jar there are twice as many 10-cent coins as 1-cent coins.
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300难题
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What is the value of x ?
1.$$4^{x+1}$$ +$$4^{x}$$ =320
2.$$x^{2}$$=9
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300难题
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Is xy< 6?
1.x< 3 and y< 2.
2.$$\frac{1}{2}$$< x< $$\frac{2}{3}$$and $$y^{2}$$< 64.
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300难题
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Alan and Sue have each been saving one dollar a day and will continue to do so for the next month. If Sue began saving several days before Alan, in how many days from today will Alan have saved one-half as much as Sue?
1.As of today, Alan has saved 7 dollars and Sue has saved 27 dollars.
2.Three days from today, Alan will have saved one-third as much as Sue.
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300难题
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In the figure above, the shaded region represents the front of an upright wooden frame around the entrance to an amusement park ride. If RS= $$\frac{5\sqrt{3}}{2}$$ meters, what is the area of the front of the frame?
1.x = 9 meters
2.ST=$$2\sqrt{3}$$ meters
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300难题
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If cubical blocks in a display are stacked one on top of the other on a flat surface, what is the volume of the stack of blocks in cubic centimeters?
1.The volume of the top block is 8 cubic centimeters.
2.The height of the stack of blocks is 10 centimeters.
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300难题
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What is the length of the hypotenuse of △ABC ?
(1)The lengths of the three sides of △ABC are consecutive even integers.
(2)The hypotenuse of △ABC is 4 units longer than the shorter leg.
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300难题
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In the rectangular coordinate system, line k passes through the point (n, - 1). Is the slope of line k greater than zero?
1.Line k passes through the origin.
2.Line k passes through the point (1,n+ 2).
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300难题
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Patricia purchased x meters of fencing. She originally intended to use all of the fencing to enclose a square region, but later decided to use all of the fencing to enclose a rectangular region with length y meters greater than its width. In square meters, what is the positive difference between the area of the square region and the area of the rectangular region?
1. xy=256
2. y=4
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300难题
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Is the perimeter of a certain rectangular garden greater than 50 meters?
1.The two shorter sides of the garden are each 15 meters long.
2.The length of the garden is 5 meters greater than the width of the garden.
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300难题
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When opened and lying flat, a birthday card is in the shape of a regular hexagon. The card must be folded in half along 1 of its diagonals before being placed in an envelope for mailing. Assuming that the thickness of the folded card will not be an issue, will the birthday card fit inside a rectangular envelope that is 4 inches by 9 inches?
1.Each side of the regular hexagon is 4 inches long.
2.The area of the top surface (which is the same as the area of the bottom surface) of the folded birthday card is less than 36 square inches.
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300难题
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In rectangular region PQRS above, T is a point on side PS. If PS = 4, what is the area of region PQRS ?
1.△QTRis equilateral.
2.Segments PT and TS have equal length.
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