单项选择题

When Nick Holonyak set out to create a new kind of visible lighting using semiconductor alloys, his colleagues thought he was unrealistic. Today, his discovery of light - emitting diodes, or LEDs, ae used in everything from DVDs to alarm clocks to airports.
Nick Holonyak' s colleagues thought it was possible to invent a new kind of visible lighting.

A. Right
B. Wrong
C. Not mentioned
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单项选择题
More than 80 percent of US adults have a less than 10 - percent risk of developing heart disease in the next 10 years, according to a report in the Journal of the American College of Cardiology. Just 3 percent have a risk that exceeds 20 percent. Only 3 percent of US adults have a more than 10 percent 10 year risk of heart disease.
A. Right
B. Wrong
C. Not mentioned
单项选择题
Norwich, the capital of the part of Britain known as East Anglia, has been in existence for more than two thousand years. It began as a small village beside the River Wensum. At the time of the Norman invasion in 1066, it had grown to become one of the largest towns in England. The River Wensum flows by Norwich.
A. Right
B. Wrong
C. Not mentioned
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