According to the author，people are suspicious of the professional judgment of scientists because （ ）．
A．their pronouncements often turn out to be wrong
B．sometimes they hide the source of their research funding
C．some of them do not give priority to intellectual honesty
D．they could be influenced by their association with the project concerned
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The pursuit of leisure on the part of the employees will certainly not ______ their prospect of promotion.
A．spur
B．further
C．induce
D．reinforce
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What‘s the author‘s purpose of writing this passage? 查看材料
A. To emphasize that gravity is essential for us.
B. To explain what gravity is.
C. To advocate environmental protection.
D. To illustrate how gravity works.
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听力原文： The economic costs of noise to society are several. Airports are currently operating at less capacity because of noise regulations which restrict their hours of operation．For instance, at Washington's National Airport jet traffic is not allowed from 11 pm to 7 am. Other airports restrict the use of certain runways．One estimate is that noise restrictions reduce possible airport use by 20 percent．The profitable cargo trade is especially affected by night restrictions
In the case of airports，jet engines may be modified to reduce their noise level．One estimate is that $5.7 billion would be required to equip all existing jet engines with noise control devices．However, even taking this step will not reduce noise levels at a11 points to acceptable values．some combination of methods is probably necessary．
If all aircraft were made quieter by existing methods, there would be a number of economic benefits．An increase in airport capacity would occur. Property values near airports might rise．Transportation costs to and from airports could be reduced since the airports now could be located closer to population centers．
Much research still needs to be done on the economic aspects of noise reduction and noise effects, Although some of the effects of noise pollution are known，more must be discovered about its effects on health， productivity，property values and the quality of life．Furthermore，the cost of noise pollution to the economy as a whole needs to be investigated．The public must be alerted to the dangers and economic costs of noise pollution so that people may make intelligent choices and exert appropriate pressures．
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A．It is extremely dangerous to fly in the dark.
B．Noise regulations restrict the hours of airport operation.
C．Some of its runways are not in good condition.
D．Cargo planes produce more disturbing noises at night.
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Latino youths need better education for Arizona to take full advantage of the possibilities their exploding population offers. Arizona's fast-growing Latino population offers the state tremendous promise and a challenge. Even more than the aging of the baby boomers, the Latino boom is fundamentally reorienting the state's economic and social structure.
Immigration and natural increase have added 600,000 young Latino residents to the state's population in the past decade. Half of the population younger than 18 in both Phoenix and Tucson is now Latino. Within 20 years, Latinos will make up half of the homegrown entry-level labor pool in the state's two largest labor markets.
What is more, Hispanics are becoming key economic players. Most people don't notice it, but Latinos born in Arizona make up much of their immigrant parents' economic and educational deficits. For example, Second-generation Mexican-Americans secure an average of 12 grades of schooling where their parents obtained less than nine. That means they erase 70 percent of their parents' lag behind third-generation non-Hispanic Whites in a single generation.
All of this hands the state a golden opportunity. At a time when many states will struggle with labor shortages because of modest population growth, Arizona has a priceless chance to build a populous, hardworking and skilled workforce on which to base future prosperity. The problem is that Arizona and its Latino residents may not be able to seize this opportunity. Far too many of Arizona's Latinos drop out of high school or fail to obtain the basic education needed for more advanced study. As a result, educational deficits are holding back many Latinos--and the state as well. To be sure, construction and low-end service jobs continue to absorb tens of thousands of Latino immigrants with little formal education. But over the long term, most of Arizona's Latino citizens remain ill-prepared to prosper in an increasingly demanding knowledge economy.
For the reason, the educational uplift of Arizona's huge Latino population must move to the center of the state's agenda. After all, the education deficits of Arizona's Latino population will severely cramp the fortunes of hardworking people if they go unaddressed and could well undercut the state's ability to compete in the new economy. At the entry level, slower growth rates may create more competition for low-skill jobs, displacing Latinos from a significant means of support. At the higher end, shortages of Latinos educationally ready to move up will make it that much harder for knowledge-based companies staff high-skill positions.
The Latino population is changing Arizona's______.
A．aging problem
B．educational system
C．economic structure
D．financial deficits
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He failed to supply the facts relevant ________ the case in question.
A) for
B) with
C) to
D) of