[单项选择]Although the sensory receptors and brain pathways for taste and smell are independent, the two senses do interact. A great deal of what we consider taste is actually smell. If the sense of smell is obstructed, as by a head cold, the perception of taste is sharply reduced.
1. The word obstructed in the passage is closest in meaning to


A. involved
B. increased
C. developed
D. blocked

[填空题]although

[填空题]All breast cancers have estrogen receptors.

[名词解释]brain death

[单项选择]Some people have a more complicated sensory life than others. Most taste tuna only when they eat it. A few, though, taste it when they hear a particular word, such as "castanet". Others link the color red with the letter "S" or make some other inappropriate connection between stimulus and response. Such people are known as synaesthetes, and the phenomenon of synaesthesia has puzzled brain scientists since it was recognized over a century ago.
Most researchers in the field suspect synaesthesia is caused by crossed wires in synaesthetes’ brains, but until recently they have had no way to check this hypothesis. However, the development of a technique called diffusion-tensor imaging has changed that. And researchers at the University of Amsterdam have just applied it to the brains of 18 women (the sex more likely to experience synaesthesia) who have the most common form of the condition. This is called grapheme-color synaesthesia. It is a tendency to see letters and numbers in color.<

[单项选择]Pathways to Research: Problem-solving 　　1. Pittsburgh’s many hills aren’t kind to bikers. Anyone hoping to pedal to work there has to contend with steep streets like Canton Avenue, which famously climbs at a nearly 40-degree angle. As a result, some residents avoid biking altogether. 　　2. But University of Pittsburgh graduate Micah Toll, 23, and a few friends recently launched an invention that they hope will increase the city’s pedal power. An electric bike called to Pulse PEVO. A super-strong battery powers the bicycle. Able to hit nearly 20 miles per hours without pedaling, it zips battery powers the bicycle. Able to hit nearly 20 miles per hour without pedaling , it zips up the city’s most daunting(令人却步的)hills.Toll hopes it will persuade people in Pittsburgh and elsewhere to get out of their cars and onto bikes. 　　3. If it sounds like Toll has a knack(窍门) for fixing problems, that’s because he does. In high school, he designed a new type of construction beam. It weights no more

[单项选择]___ nerve pathways connect the eye directly to the pineal gland, that gland is extremely sensitive to light.
A. Because
B. That
C. How
D. By

[单项选择]

It is said that the more pathways that are created ______.
A. the more efficient thinking becomes
B. the more complicated thinking becomes
C. the less efficiently people work