taxi, driver and accident data from two fleets (车队) of yellow and blue taxis in Singapore suggested that yellow taxis have fewer accidents than blue taxis. The higher visibility (可见性) of yellow makes it easier for drivers to avoid getting into accidents with yellow taxis, leading to a lower accident rate.

　　The study was led by Prof. Ho. To test whether there was a causal relationship between the color of a taxi and the number of accidents the taxi had, the research team analysed data collected by the largest taxi company in Singapore. The researchers found that yellow taxis have about 6.1 fewer accidents per 1, 000 taxis per month.

　　The researchers also studied the economic effect of changing the color of the entire fleet of taxis to yellow. The Singapore taxi company involved in the study owns about 16,700 taxis in a ratio (比率) of one yellow taxi to three blue taxis. If a commercial decision is made to switch from blue to yellow taxis, 76.6 fewer accidents would occur per month or 917 fewer accidents per year. Assuming an average repair cost of $1,000 per car and a downtime of six days, switching the color of all taxis to yellow could produce an annual saving of $2 million.

　　"We are eager to continue to validate (证实) the findings of our study by looking at the use of yellow in other types of public transport, such as school buses. For instance, we hope to compare the accident rates of yellow school buses against other colors to find out if yellow is indeed a safer color for school buses. Besides, we are also interested to look at private hire vehicles and do a comparison of the accident rates of vehicles that are of different colors." explained Prof. Ho.

28. Why do yellow taxis result in fewer accidents?

A. Because yellow can be seen more easily.

B. Because yellow signals a warning of danger.

C. Because drivers tend to be more careful in yellow taxis.

D. Because people act more quickly in yellow surroundings.

29. What's Prof. Ho's study based on?

A. Physical risks taxi passengers experience.

B. The economic effect of changing taxi color.

C. Data from Singapore's largest taxi company.

D. Personal reports from taxi drivers worldwide.

30. What do Prof Ho's words in the last paragraph suggest?

A. School buses should be painted yellow. B. Their findings are worth popularizing.

C. Yellow should be widely used in public transport. D. Their study will be furthered.

31. What can be the best title for the text?

A. Caution: yellow taxis ahead B. Safer to ride in yellow taxis

C. Why are yellow taxis preferred? D. How can colors help prevent accidents?

　　Steven Spielberg's 2002 science-fiction thriller Minority Report produced a world where computers could read minds and predict the future. It seemed fanciful at the time, but fantasy is edging closer to fact.

　　On Jan 31, a team of scientists at UC Berkeley, led by Robert Knight programmed computers to decode (破译) brain waves and replay them as words. Five months earlier, another group of Berkeley scientists showed their colleagues short movies and used computers to play back in color what people saw.

　　These experiments are a big advance from 2006, when a French scientist first replayed images from a human mind, a black-and-white checkerboard pattern. The possibilities are great: a disabled person could"speak"; doctors could access the mind of a patient who fainted; you could rewatch your dreams on an iPad. There are, of course, equally dark side, such as the involuntary take out of information from the brain.

In spite of these breakthroughs, Jack Gallant, the neuroscientist who led the first Berkeley