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300难题
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One analyst of the liquor industry estimated that this year a few liquor stores have experienced declining sales of up to fifty percent but predicted that the industry as a whole will maintain a volume of sales fairly close to last year.
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300难题
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Statisticians studying the health effects of uranium mining on Navajo communities have found others besides miners and millworkers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.
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300难题
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In a crowded, acquisitive world, the disappearance of lifestyles such as those once followed by southern Africa's Bushmen and Australia's Aboriginal people, requiring vast wild spaces and permitting little accumulation of goods, seem inevitably doomed.
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300难题 OG17
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The newspaper story accurately recounted the history of the colonial mansion, that it contained thirteen rooms, and that it had a reputation for being a haunted house.
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300难题
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A natural response of communities devastated by earthquake or flood is to rebuild on the same site, overlooking the possibility that the forces that caused it could be repeated.
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300难题
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During an ice age, the buildup of ice at the poles and the drop in water levels near the equator speed up the earth's rotation, like a spinning figure skater whose speed increases when her arms are drawn in.
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300难题
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Sophisticated laser-guided land graders can now flatten uneven farmland almost perfectly so as not to waste rainwater in runoff down sloping fields.
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300难题
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Evidence of some shifts in the character of violence on television is emerging from a new study of 500 television programs by the Center for Media and Public Affairs, a nonprofit research center in Washington, D.C., a study that is underwritten by a number of educational institutions.
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300难题
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Before Colette, the female writers of France had been aristocrats, from Mme de Lafayette to Anne de Noailles; there were no Jane Austens or Brontë sisters, perhaps because there were almost no clergymen's daughters.
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300难题 OG17
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Financial uncertainties from the accident at Three Mile Island may prove even more deterring to the nuclear industry than political opposition is.
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300难题
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Although many art patrons can readily differentiate a good debenture from an undesirable one, they are much less expert in distinguishing good paintings and poor ones, authentic art and fakes.
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300难题
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Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundreds of monasteries.
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300难题
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Remembered almost as an epic among America's 12,000 Bosnian Muslims is the digging of Chicago's subway tunnels in the early 1900s, one of the proudest of family legends.
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300难题
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Chinese public buildings erected under a construction code of the Sung dynasty have withstood earthquakes well because the white cedar used has four times the tensile strength of steel and the timber frame, incorporating many joints and few nails, is flexible.
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300难题
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Plausible though it sounds, the weakness of the hypothesis is that it does not incorporate all relevant evidence.
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300难题
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Like the one reputed to live in Loch Ness, also an inland lake connected to the ocean by a river, inhabitants of the area around Lake Champlain claim sightings of a long and narrow “sea monster.”
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300难题
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The cathedrals of the Middle Ages were community centers just as much as they were purely religious edifices; and they were structures that represented a city's commitment to a public realm, the opposite of being a private one.
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300难题
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A country's per capita national debt is its national debt divided by its population. Is the per capita national debt of Country G within $5 of $500 ?
1. Country G`s national debt to the nearest $1,000,000,000 is $43,000,000,000.
2. Country G`s population to the nearest 1,000,000 is 86,000,000.
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300难题
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A $10 bill (1,000 cents) was replaced with 50 coins having the same total value. The only coins used were 5-cent coins, 10-cent coins, 25-cent coins, and 50-cent coins. How many 5-cent coins were used?
1.Exactly 10 of the coins were 25-cent coins and exactly 10 of the coins were 50-cent coins.
2.The number of 10-cent coins was twice the number of 5-cent coins.
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300难题
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Each of the five divisions of a certain company sent representatives to a conference. If the numbers of representatives sent by four of the divisions were 3,4, 5 and 5, was the range of the numbers of representatives sent by the five divisions greater than 2 ?
1.The median of the numbers of representatives sent by the five di\isions was greater than the average (arithmetic mean) of these numbers.
2.The median of the numbers of representatives sent by the five divisions was 4.
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