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  3. Winter in many places means ice skating, sledding and snowball fights. But unless someone is prepared, outdoor fun can also mean

Winter in many places means ice skating, sledding and snowball fights. But unless someone is prepared, outdoor fun can also mean

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问题     Winter in many places means ice skating, sledding and snowball fights. But unless someone is prepared, outdoor fun can also mean frostbite(冻伤). Frostbite is damage that happens when skin【B1】______extreme cold for too long. It mainly happens on the hands, feet, nose and ears. People with【B2】______ cases of frostbite that affect only the skin may not suffer any【B3】______damage. But if deeper tissue is affected, a person is likely to feel pain every time the area gets cold. If blood vessels are damaged, people can suffer an【B4】______, gangrene(坏疽). Sometimes, doctors have to remove frostbitten areas like fingers and toes.
    The best way to avoid【B5】______injuries is to be prepared for the outdoors. Here is a simple way to remember four basic steps to staying warm. Think of COLD. C stands for cover. Wear a hat and scarf to keep heat from【B6】______through the head, neck and ears. O stands for overexertion. Avoid activities that will make you sweaty. Wet clothes and cold weather are a bad mix L is for layers. Wearing【B7】______, lightweight clothes, one layer on top of another, is better than a single heavy layer of clothing. D is for dry. In other words, stay as dry as possible.【B8】______the places where snow can enter, like the tops of boots, the necks of coats and the wrist areas of mittens. And there are a couple of other things to【B9】______: Eating snow might be fun but it lowers the body’s temperature. And drinking【B10】______ might make a person feel warm, but what it really does is weaken the body’s ability to hold heat.
【B1】
选项
答案is exposed to
解析 分析句子结构可知，空格所在的从句中缺少谓语。由此判断，空格处需填入一个动词(词组)作谓语。结合录音可知，答案为is exposed to，意为“暴露”。
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