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室内空气污染的甲醛主要来自（）
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确诊宫颈癌，应首选的检查方法是（）
There are many things we can do to help ourselves to live longer. Fasten the safety belts each time we get into a car. Each year 10,000 lives could be saved by the use of safety belts. It is surprising then that not everyone wears them. Some people say they will never be in an accident be cause they are careful drivers. Such an excuse is weak. In fact, it is false. I have a friend named Jane Tailor. She is a safe driver, I think. One day, she was driving her car to the airport, but she did not have her safety belt on.: Suddenly a huge truck went through the Ted light. She was hit by it. The next thing she knew was that she was in the hospital. She suffered from a head injury and broken bones. Where was Jane Tailor going one dayShe was going（）
一男性，易激动，工作认真而且很忙，争强好胜，雄心勃勃。因小事上火，发脾气后，心绞痛入院，诊断为冠心病。 发病的明显原因是
6月某食堂供应蛋炒饭引起近百人食物中毒，发病者潜伏期约8小时，以腹痛、腹泻为主要症状，不发热，病程为16～36小时，预后良好。经卫生学调查发现蛋炒饭使用的是前一天的剩饭。 不属于该食物中毒预防措施的是
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