Question of the Day




To date, astronomers have catalogued thousands of exoplanets, more than a dozen of them are potentially habitable. The most recent is Ross 128b: an Earth-sized planet orbiting a nearby star, it is probably located at a distance that would allow for liquid water.


B. exoplanets, more than a dozen of which
C. exoplanets; more than a dozen of which
D. exoplanet, more than a dozen of these


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In a study of 39 elite cyclists, Oxford University researcher Kieran Clarke and others found the athletes were able to go 400 meters further in half an hour after drinking a ketone drink than after drinking a carbohydrate- or fat-based energy drink. One reason for the increased performance could be that the ketones prevented their bodies from producing too much lactate, which causes people to feel achy after strenuous exercise. Rats on a ketone diet have also run farther on a treadmill and completed a maze faster than rats on a regular diet.


The passage implies that carbohydrate- and fat-based energy drinks


A. may not inhibit the production of lactate.
B. help athletes work out more strenuously.
C. have no effect on athletic performance.
D. are more effective than ketone-based energy drinks.


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Traditional methods of making pottery are still used by a number of Native American tribes, and wares are produced by them for practical use as well as sale to collectors.


B. tribes, wares being produced by them
C. tribes that produce wares
D. tribes, they produce wares


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There are many theories about why flying might leave passengers more vulnerable to crying – sadness at leaving loved ones, excitement about the trip ahead, homesickness. But there is also some evidence that flying itself may also be responsible. An emerging body of research is suggesting that soaring 35,000 ft above the ground inside a sealed metal tube can have strange effects on our minds, affecting our sleep cycles and causing drowsiness.


B. increasing the pressure in our ears and nose.
C. altering our moods and changing our perception.
D. restricting our movements and causing our muscles to stiffen.


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A major reassessment of dinosaurs that began in the 1960s and finally took hold in the 1980s positioned these creatures not as dull evolutionary failures but as active, warm-blooded, animals.


B. active warm-blooded, animals.
C. active, warm-blooded animals.
D. actively warm-blooded animals.


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The current reality of smart cities is that there aren’t any. At the end of the day, most so-called smart cities are just cities with a few or several standout smart projects. Such projects can take shape in a variety of ways. In Pittsburgh, the Pennsylvania Department of Transportation is piloting a $30 million smart-signal system that utilizes adaptive traffic signals to read traffic conditions and make adjustments to keep traffic flowing. Kansas City invested nearly $15 million in a smart lighting project that will install 200 lights along its new streetcar line. The lights have built-in sensors and cameras that detect the presence of people and can turn off when no one is around to save 20–30 percent in electricity costs. Both efforts represent the potential of smart city technology, but they certainly do not represent the networked, end-to-end planning of an entire smart city.


The references to “adaptive traffic signals” and “a smart lighting project” primarily serve to


A. celebrate the power of technological innovation.
B. call attention to recent developments in urban design.
C. illustrate the exceptional nature of certain projects.
D. emphasize the growing popularity of smart city technologies.


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Tipping as a phenomenon has long fascinated economists: paying extra, even though we are not legally required to do so, seems to go against our own best interest.


B. economists paying extra –
C. economists, paying extra,
D. economists; paying extra


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Over the last several decades, research has effectively disproved the claim that coffee is harmful to health. In fact, data suggest that coffee may offer some health benefits. In comparison to non-coffee drinkers, for example, drinking about three cups of coffee a day appeared to reduce the risk of heart problems.


B. about three cups of coffee a day can reduce people’s risk of heart problems.
C. heart problems are reduced in people who drink about three cups of coffee daily.
D. people who drink about three cups of coffee a day have a reduced risk of heart problems.


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