The more television children watch, the less competent they are in mathematical knowledge. More than a third of children in the United States watch television for more than five hours a day; in South Korea the figure is only 7 percent. But whereas less than 15 percent of children in the United States understand advanced measurement and geometric concepts, 40 percent of South Korean children are competent in these areas. Therefore, if United States children are to do well in mathematics, they must watch less television. Which one of the following is an assumption upon which the argument depends
A. Children in the United States are less interested in advanced measurement and geometric concepts than are South Korean children.
B. South Korean children are more disciplined about doing schoolwork than are children in the United States.
Children who want to do well in advanced measurement and geometry will watch less television.
D. A child’s ability in advanced measurement and geometry increases if he or she watches less than one hour of television a day.
E. The instruction in advanced measurement and geometric concepts available to children in the United States is not substantially worse than that available to, South Korean children.
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Since Mayor Drabble always repays her political debts as soon as possible, she will almost certainly appoint Lee to be the new head of the arts commission. Lee has wanted that job for a long time, and Drabble owes Lee a lot for his support in the last election. Which one of the following is an assumption on which the argument depends
A. Mayor Drabble has no political debt that is both of longer standing than the one she owes to Lee and could as suitable be repaid by an appointment to be the new head of the arts commission.
B. There is no one to whom Mayor Drabble owes a greater political debt for support in the last election than the political debt she owes to Lee.
C. Lee is the only person to whom Mayor Drabble owes a political debt who would be willing to accept an appointment from her as the new head of the arts commission.
D. Whether Lee is qualified to head the arts commission is irrelevant to Mayor Drabble’s decision.
E. The only way that Mayor Drabble can adequately repay her political debt to Lee is by appointing him to head the arts commission.
水磨石面层砂浆色粉与石子的参考比例。当石子的空隙率小于40%时，色粉：石子(质量比)=1:3或1:4。( )
A. 对
B. 错
一般抹灰用于浴室、潮湿车间等墙裙、勒脚或地面基层，其体积配合比为：水泥:砂=1:5或1:6。( )
A. 对
B. 错
Inspection system X and inspection system Y, though based on different principles, each detect all product flaws, but they each also erroneously reject three percent of flawless products. Since false rejections are very costly, money will be saved by installing both systems, instead of either one or the other, and rejecting only products found flawed by both. The argument above requires which of the following assumptions
A. The three percent of flawless products that system X rejects are not all the same products, piece for piece, that system Y erroneously rejects.
B. It is less costly to accept a flawed product than to reject a flawless one.
C. In their price range, systems X and Y are the least errorprone inspection systems on the market.
D. Whichever system performs the second inspection needs to inspect only products not rejected by the first system.
E. Any way of detecting flaws, other than by using either system X or system Y, requires complete disassembly of the products.
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