Prep2012-Pack1-CR-038 VCR002878 Medium
Surveys in Domorica indicate that only 10 percent of Domoricans in their twenties read a newspaper regularly, while more than half of all Domoricans over thirty read a newspaper regularly. Although Domoricans in their twenties constitute a large proportion of the population, newspaper publishers nonetheless predict that ten years from now, the percentage of Domoricans who regularly read a newspaper will probably be no lower than it is today.
Which of the following, if true, provides the strongest grounds for the newspaper publishers’ prediction?
A. The number of Domoricans in their twenties is less than the number of Domoricans over thirty.
B. The number of newspapers in Domorica has been gradually increasing over the past several decades.
C. The proportion of Domoricans in their twenties who regularly read a newspaper has always been low.
D. The surveys defined a regular reader of a newspaper as someone who reads a newspaper more than twice a week.
E. The proportion of Domoricans who regularly read a newspaper was higher 20 years ago than it is today.
Prep2012-Pack1-CR-039 VCR003744 Medium
Which of the following most logically completes the passage?
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why-___________.
A. large moths are generally able to maneuver better in flight than smaller moths
B. large moths are proportionally much more common in warm climates than in cool climates
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
E. most predators of moths prey not only on several different species of moth but also on various species of other insects
Prep2012-Pack1-CR-040 VCR003839 Medium
In the late 1980s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline— increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.
Which of the following, if true, most seriously weakens the reasoning?
A. Killer whales in the North Pacific usually prey on seals and sea lions but wil, when this food source is scarce, seek out other prey.
B. There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980s.
C. Along the Pacific coast of North America in the 19805, sea otters were absent from many locations where they had been relatively common in former times.
D. Following the in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
E. The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.
