题目

A study published Monday found that people who sleep less tend to be fat，and experts said it's time to find out if more sleep will fight fatness. “We've put so much emphasis on diet and exercise that we've failed to recognize the value of good sleep，” said Fred Turek，a physician at Northwestern University. Monday's study from Eastern Virginia Medical School in Norfolk covered 1,000 people and found that total sleep time decreased as body mass index—a measure of weight based on height increased. “Men slept an average of 27 minutes less than women and overweight and fat patien11．下列物质在氧气中燃烧，火星四射，有黑色固体生成的是（　　）A．硫B．木炭C．铁丝D．红磷