【正确答案】 A

【答案解析】[听力原文]
Doctors in Britain think they may have discovered why some people snore when sleeping. Based on a study of eight families, in which one or more members have a serious snoring problem, the doctors say that snoring could be genetically inherited. If that theory is correct, it could explain why some people suffer more than others from the condition.
It"s estimated that six percent of men in Britain snore but two percents suffer from what"s known as sleep apnea. Those with the condition snore very loudly and can stop breathing for more than ten seconds as much as ten times an hour. Sufferers are often unaware of their condition, but it does lead to disturbed sleep, a risk of depression and even the danger of falling asleep while driving.
It"s thought it could be caused by having either a short jaw or by being overweight. But doctors of the Royal Halemshire Hospital in Sheffield believe there may be a genetic element. They are studying eight families where one or more members have the condition. So far they"ve found evidence that sleep apnea can run in families. The next step is for blood samples to be taken to determine if a gene is involved. If it is, it could help diagnose people with the condition earlier.