【题目】 We know that too much of the wrong kind of food can be bad for our health, but for some people having a food allergy, eating certain things can actually be harmful. Now it is seemingly affecting more and more of us.
An allergy is caused by the immune system fighting substances in the environment, known as allergens, that it should see as harmless. 【1】It means people have to spend their lives following strict dietary restrictions and worrying about the ingredients of everything they consume. We often hear about people having allergies to dairy products and to peanuts. Last year a teenager died after suffering a fatal allergic reaction from eating a baguette containing sesame seeds. 【2】
Research has found that this problem is particularly affecting children. 【3】 Dr Alexandra Santos from King’s College London says food allergy now affects about 7 percent of children in the UK, and 9 percent of those in Australia.
【4】 Dr Santos says, the increase in allergies is not simply the effect of society becoming more aware of them and better at diagnosing them. 【5】 She adds that possible factors are pollution, dietary changes and less exposure to bacteria, which change how our immune systems respond.
A.So what might be the cause?
B.It seems to be more environmental.
C.Similarly, food allergic reaction is deadly.
D.This led to a call for better food-labeling laws.
E.Besides, more adults are suffering from food allergies.
F.However, food allergies can cause life-threatening reactions.
G.More and more of them are having allergic reactions to certain foodstuffs.
在线课程【答案】
【1】F
【2】D
【3】G
【4】A
【5】B
【解析】
这是一篇说明文。对于有些人来说，食物过敏严重影响身体健康，甚至导致死亡。越来越多的人食物过敏，除了社会因素之外，环境问题干系更大。
【1】
上一句说过敏反应是由于免疫系统对抗环境中的物质及过敏原引起，这些物质应该是免疫系统视为无害的。这一句是对上一句的补充说明和修正：食物过敏可能会引起威胁生命的反应。故选F。
【2】
上一句说去年有一个少年因食用含有芝麻的长棍面包而引发过敏致死，合理逻辑推理，这一事件会导致人们呼吁立法推进优化食品标签。故选D。
【3】
这句话在段中承上启下。前一句说研究发现过敏问题尤其对孩童影响很大。很面一据用数据说明在英国和澳大利亚患过敏症的孩童的百分比，关键词是allergy和children，中间这据说越来越多的孩童对某些食物过敏，把前后句衔接了起来，故选G。
【4】
段首句为这段的中心句。后文Dr Santos谈到引起过敏症的原因，此处用一个问句引出后文。故选A。
【5】
上一句说过敏症的增加不仅是社会意识增强和诊疗更先进的结果，此句承上说明引起过敏症的更重要原因。故选B。
七选五的解题技巧之一是根据上下文关键词汇来锁定线索。即：要关注空白前后的名词和动词，然后在选项中查找它们的近义词、反义词、同义词、同根词等。其次是一些专有名词，比如说数词、代词、时间、年代、地点/名称等。在本文中，第1小题中的“allergy”、“life-threatening”，第2小题中的“this”，第3小题中的“them”、“allergic”，第4小题中的“cause”，均与上下文有相呼应的词语。