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GWD Certain genetically modified strains of maize produce a natural insecticide that protects against maize-eating insects. The insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by the wind and often blows onto milkweed plants that grow near maize fields. Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When, in experiments, these caterpillars were fed milkweed leaves dusted with pollen from modified maize plants, they died. Therefore, use of the modified maize inadvertently imperils monarch butterflies.Which of the following, if true, most seriously weakens the argument?
GWD Smithtown University's fund-raisers succeeded in getting donations from 80 percent of the potential donors they contacted. This success rate, exceptionally high for university fund-raisers, does not indicate that they were doing a good job. On the contrary, since the people most likely to donate are those who have donated in the past, good fund-raisers constantly try less-likely prospects in an effort to expand the donor base. The high success rate shows insufficient canvassing effort.Which of the following, if true, provides more support for the argument?
In parts of the Caribbean, the manatee, an endangered marine mammal, has long been hunted for its meat. Having noted the manatee hunters' expert knowledge of manatees' habits, local conservationists are encouraging the hunters to stop hunting and instead to take tourists on boat rides to see manatees. Tourist interest is high, so the plan has promise of achieving the twin goals of giving the former hunters a good income and helping ensure the manatees' survival.Which of the following, if true, raises the most serious doubt about the plan's chance of success?
GWD In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.If the statements above are true, then it is also possible that in Patton City
GWD The ancient Nubians inhabited an area in which typhus occurred, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.Which of the following is an assumption on which the argument relies?
PREP07 Test 2 A certain business produced x rakes each month from November through February and shipped $$\frac x 2$$ rakes at the beginning of each month from March through October. The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months from November through October?
PREP08 Test 2 The country of Baurisia has, until now, been self-sufficient in both grain and meat. However, with growing prosperity in Baurisia has come a steadily increasing per capita consumption of meat, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income in Baurisia is almost certain to rise further but increases in domestic grain production are highly unlikely, Baurisia is soon likely to become an importer of grain.Which of the following, if true, most seriously weakens the argument?
OG12 OG15 OG17 OG16 OG18 OG19 OG20 OG2022 Last year, if Arturo spent a total of $12,000 on his mortgage payments, real estate taxes, and home insurance, how much did he spend on his real estate taxes?(1)Last year, the total amount that Arturo spent on his real estate taxes and home insurance was $$33\frac{1}{3}$$ percent of the amount that he spent on his mortgage payments.(2)Last year, the amount that Arturo spent on his real estate taxes was 20 percent of the total amount he spent on his mortgage payments and home insurance.
A municipal employment training center plans to offer tax deductions for local workers who take classes that retrain workers in high-tech job skills. Although employing these workers in local jobs that require high-tech skills will generate tax profits that exceed the cost of the tax deductions, this practice is unwise. Local community colleges could offer classes to train students in high-tech job skills without offering these students tax deductions.Which of the following, if true, most strongly supports the training center's policy of offering tax deductions for local workers?
Most of AmTrans' weekly trains travel to and from Harcourt Terminal, a heavily trafficked train station. AmTrans depends for its success on running trains in all types of weather and punctual arrivals, and is consequently planning to replace half of its current trains with bullet trains, which can operate regardless of weather conditions and which can travel at twice the speed of AmTrans' current trains.Which of the following, if true, could present the most serious disadvantage for AmTrans in replacing its current trains with bullet trains?
Two secretaries, Sally and Lisa, type at even but difference paces. Sally is more experienced and types 80 characters per minute. Lisa, a beginner, can type only 30 characters per minute. On one day, Lisa starts typing before Sally. At some point, both have typed the same number of characters. Then both continue typing and Sally types 800 more characters until her computer breaks down. Assuming Lisa does not take any break, how long, in hours, will it take her to finish typing the same number of characters?
GWD PREP08 Test 1 The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.Which of the following is an assumption on which the argument relies?
Bevex, an artificial sweetener used only in soft drinks, is carcinogenic for mice, but only when it is consumed in very large quantities. To ingest an amount of Bevex equivalent to the amount fed to the mice in the relevant studies, a person would have to drink 25 cans of Bevex-sweetened soft drinks per day. For that reason, Bevex is in fact safe for people.In order for the conclusion that Bevex is safe for people to be properly drawn, which of the following must be true?
Vivien Thomas, who had no formal medical training, struggled against overwhelming odds to become a cardiac surgeon and eventually to receive an honorary doctorate from Johns Hopkins University.who had no formal medical training, struggled against overwhelming odds to become who, having no formal medical training, he struggled against overwhelming odds in becoming who had no formal medical training, in struggling against overwhelming odds, he became having had no formal medical training, in struggling against overwhelming odds to become who, having had no formal medical training and struggled against overwhelming odds, became
PREP2012 Fashion company executive: The number of competing brands of clothing is increasing much more quickly than is consumer demand for new clothing. As a result, it is becoming ever more for our clothing company to keep consumers focused on our products. To increase our sales, therefore, our company plans to introduce innovative, eye-catching lines of clothing much more frequently.To evaluate whether the plan described by the executive would be likely to achieve its goal, it would be most useful to know which of the following?
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A city offers ice skating and skiing as part of its winter sports program. If each of the people in the program participates in at least one of these sports, how many participate in skiing only?

(1)  of the people participate in ice skating.

(2)  of the people participate in skiing.
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The script on a recently discovered scroll was used solely by two scribal communities, the Bethel community and the Shemula community. Analysis of the jar in which the scroll was found, whose markings indicate that it is the scroll’s original container, showed that it was made of clay found in the vicinity of the Bethel community but not of the Shemula community, fifty miles away. This shows that the scroll most likely originated in the Bethel community.

Which of the following is an assumption that the argument makes?
300难题 A bank account earned 2% annual interest, compounded daily, for as long as the balance was under $1,000, starting when the account was opened. Once the balance reached $1,000,the account earned 2.5% annual interest, compounded daily until the account was closed. No deposits or withdrawals were made. Was the total amount of interest earned at the 2% rate greater than the total amount earned at the 2.5% rate? 1.The account earned exactly $25 in interest at the 2.5% rate. 2.The account was open for exactly three years.
300难题 First discovered several years ago in North American lakes and rivers, the northern snakehead is a nonnative fish with no local predators. To keep the northern snakehead's population from growing, for the past three years wildlife officials have been paying recreational fishers for each northern snakehead they catch. In this way, the officials hope to stop the northern snakeheads from eliminating rare native fish species. To evaluate the likelihood that the wildlife officials' plan will succeed, it would be most useful to determine which of the following?
OG2022 Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year. This year the plantings are being seriously damaged by bollworms. Bollworms, however, are not necessarily developing resistance to the cotton's insecticide. Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions. So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms. In evaluating the argument, which of the following would it be most useful to establish?