A、Dirty water. B、Medicine. C、Insects. D、Rotten fruits. B本题询问引起意外中毒的东西是什么。短文讲述意外中毒时提到，吞食清洗剂、药品或是杀虫剂都是危险的，故答案为B)。

Doctors in hospital emergency rooms often see accidental poisonings. (32) A frightened parent arrives with a child who swallowed a cleaning liquid. Or perhaps the harmful substance is a medicine. Or it might be a product meant to kill insects. These are common causes of accidental poisoning. In cases like this, seek medical help as soon as possible. Save the container of whatever caused the poisoning. And look on the container for information about anything that stops the effects of the poison.
    (33) As to saving a person choking on something trapped in the throat, the American Red Cross says a rescuer should first hit the person on the back five times between the shoulder bones. These back blows may ease the choking. If the airway is still blocked, the Red Cross suggests pushing hard five times along the victim’s belly. Even if you are the person choking, you can still help yourself. Place a closed hand just above your waist. Take hold of that hand with your other hand. Find a hard surface like a chair and rest your body on it. Then push your closed hand in and up. Red Cross experts say taking these steps can save many lives.
    (34) Moreover, bacteria can enter the body through even the smallest cut in the skin, so medical experts advise people to treat all wounds. Clean the cut with soap and water. Then cover the wound while it heals.
    (35) If you know first aid methods, you can be calmer and more helpful in case of emergency.
32. What can cause accidental poisonings according to the passage?
33. What does the American Red Cross suggest do first to save a person choking on something in the throat?
34. Why do medical experts advise people to treat all wounds?
35. Why should one know first aid methods?