Human beings can see the spatial relations among objects by processing information conveyed by light. Scientists trying to build computers that can detect spatial relations by the same kind of process have so far designed and built stationary machines. However, these scientists will not achieve their goal until they produce such a machine that can [...]

Last spring a Colorado health department survey of 72 playgrounds in private child-care centers found unsafe conditions in 95 percent of them and they ranged from splinters to equipment near collapse. (A) unsafe conditions in 95 percent of them and they ranged (B) conditions in 95 percent were unsafe and ranging (C) the ranging of [...]

The country of Maravia has severe air pollution, 80 percent of which is caused by the exhaust fumes of cars. In order to reduce the number of cars on the road, the government is raising taxes on the cost of buying and running a car by 20 percent. This tax increase, therefore, will significantly reduce [...]

Despite the approach of winter, oil prices to indus- trial customers are exceptionally low this year and likely to remain so. Therefore, unless the winter is especially severe, the price of natural gas to indus- trial customers is also likely to remain low. Which of the following, if true, provides the most support for the [...]

In the United States, injuries to passengers involved in automobile accidents are typically more severe than in Europe, where laws require a different kind of safety belt. It is clear from this that the United States needs to adopt more stringent standards for safety belt design to protect automobile passengers better.Each of the following, if [...]

Scientists calculated that the asteroid, traveling at 46,000 miles an hour, is on an elliptical path that orbits the Sun once a year and regularly brings it back toward Earth. (A) hour, is on an elliptical path that orbits the Sun once a year and regularly brings it (B) hour, is orbiting the Sun once [...]

Less than 50 percent of a certain tropical country’s wildlands remains intact. Efforts are under way to restore biological diversity in that country by restoring some destroyed wild habitats and extending some relatively intact portions of forests. However, opponents argue that these efforts are not needed because there is still plenty of wildland left. Which [...]

Exports of United States wood pulp will rise consid-erably during this year. The reason for the rise isthat the falling value of the dollar will make itcheaper for paper manufacturers in Japan and West-ern Europe to buy American wood pulp than to getit from any other source.Which of the following is an assumption made indrawing [...]

A study comparing a group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group. According to the researchers, these results strongly support the hypothesis that mental states influence the body’s vulnerability to infection. Which of the following, if [...]

Most large companies prefer customized computer software because it can be molded to fit the way a company does business, when off-the-shelf software often requires the company to alter its procedures to fit the software. (A) when (B) since (C) whereas (D) because (E) insofar as

Bill: The newspaper discontinued Dr. Andrews’ weekly humor column because the editor said that he had plagiarized the work of another humorist. Dr. Andrews explained, however, that much of the column’s material was from stories submitted by readers and that he had no idea that the offending items had been written by another humorist. Since [...]

The lack of complete historical records from the mid-to-late 1800′s have made some Black inventions difficult to trace to their originators. (A) have made some Black inventions difficult to trace to their originators (B) have made for difficulties in tracing some inventions by Blacks to their originators (C) have made it difficult to trace some [...]

If x and y are integers, what is the value of x? (1) x = y^2 (2) xy = 8 A if statement (1) BY ITSELF is sufficient to answer the question but statement (2) is not. B if statement (2) BY ITSELF is sufficient to answer the question but statement (1) is not. C [...]

In the 1950′s astronomers were divided between those who believed the universe began in a cosmic explosion (the “big bang”) with those who favored the model of an eternal and infinite steady-state universe. (A) universe began in a cosmic explosion (the “big bang”) with (B) universe began with a cosmic explosion (the “big bang”) and [...]