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  3. During an average year, about 50 people die from carbon monoxide poisoning in the UK, caused directly by fumes from home heating

During an average year, about 50 people die from carbon monoxide poisoning in the UK, caused directly by fumes from home heating

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问题    During an average year, about 50 people die from carbon monoxide poisoning in the
UK, caused directly by fumes from home heating appliances which are subsequent 【M1】______
discovered to be defective. Several hundreds people a year are made ill by inhaling 【M2】______
the fumes, and have to have hospital treatment. These deaths and illnesses are
unnecessary, and can easily prevented. 【M3】______
   Carbon monoxide has no colour, smell or taste, and it can kill. It can be
given up by any equipment which bums a fossil fuel, such as coal, gas or oil. 【M4】______
Fumes may build up in your home if the equipment is faulty, or if the chimney 【M5】______
is blocked, or if the room don’ t allow circulation of fresh air. Watch out for 【M6】______
any of the following: gas flames burned orange or yellow, and wood or coal 【M7】______
stoves which bum slowly or go out. You yourself may feel sleep, or have 【M8】______
headaches, chest oi stomach pains, sickness or sudden giddiness.
   If you notice any of the above, stop using the appliance. See a doctor
at once if you have physical symptoms. Make sure your heaters are servicing 【M9】______
regularly and keep air vents and windows unblock. 【M10】______
【M3】
选项
答案easily∧prevented--be
解析 原文叙述，“这些死亡和疾病是不必要的，而且很容易被预防”。此处的prevent应为被动语态，死亡和疾病是被预防而不是预防，因prevent前有情态动词can，故用be动词原形。因此，在prevented前加be。
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