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第2篇：ulcers
Even though ulcers appear to run in families，lifestyle plays more of a role than genetic
factors in causing the illness，according to a report in the April 13th Journal of Internal Medicine．
In particular ，smoking and stress in men and the regular use of pain．releasing medicines in women were linked with an increased risk of developing all ulcer．
Overall，61％of ulcer risk appears to be due to environmental factors，such as smoking, and the remaining 39％is due to genes according to Dr．Ismo Raiha of the University of Turky and colleagues at the University of Helsinki，Finland．Some researchers had suggested that families may spread Helicobacteria pylori ，the bacteria that can cause ulcers．However。the new study suggests this is unlikely，according to the report．
Raiha and colleagues studied data from more than 1 3，000 pairs of twins“to examine the roles of genetic and environmental factors in the origin of peptic ulcer disease．”they explain．Both twins were more likely to develop an ulcer if the pair were genetically the same as compared with a par of fraternal twins，suggesting that there must be some genetic susceptibility to ulcer development．
However，the risk was no greater in twins living together compared with twins living apart, suggesting that shared exposure to H. pylori was not to blame．“Environmental effects were not due to factors shared by family members ，and they were related to smoking and stress in men and the Use of analgesics in women，”the authors wrote．“The minor effects of shared environment to disease liability do not support the concept that the grouping of risk factors，such as H.pylori infection，would explain the genetic factor of peptic ulcer disease,”they concluded．
词汇：
ulcer／n．溃疡
lifestyle／n．生活方式
genetic／adj．基因的，遗传(性)的
stress／n．压力，紧张，造成紧张的因素
overall／adv．总的说来，大体上
environmental／adj．环境的，有关环境(保护)的
gene／n．基因
colleague／n．同事，同僚
bacteria／n．【bacterium的复数】细菌
peptic／adj．消化性的 ．
fraternal／adj．异卵双生的，两合子的
susceptibility／n．敏感性，过敏性
analgesic／n．止痛剂，镇痛药
liability／n．倾向
练习：
1．According to the passage，which of the following is a very likely cause of ulcer in men?
A)Smoking and stress．
B)Drinking and smoking．
C)Genes and children．
D)Use of a certain medicine．
2．What factors contribute to over half the ulcers?
A)Hereditary factors．
B)Economic factors．
C)Environmental factors．
D)Genetic factors．
3．In relation to ulcers，experts study twins in order to examine
A)the roles of genetic factors．
B)the roles of environmental factors．
C)the roles of both genetic and environmental factors．
D)the roles of brotherhood．
4．”Environmental effects” in the fourth paragraph refers to effects brought about by
A)a clean environment．
B)smoking and stress in men and use of pain-killing medicine in women．
C)factors shared by family members such as genes and the food they eat．
D)shared exposure to H. pylori infection．
5．The passage argues that
A)ulcers are related to genes．
B)ulcers are chiefly related to lifestyle．
C)ulcers appear in men and women．
D)ulcers are caused by pylori infection
答案及分析：
1．A 因第一段中提到"smoking and stress in men…"，其他各项均与文中内容不符。
2．c 第二段的第一句"Overall，61％of ulcer risk appears to be due tO environmental
factors…"，故选C项。
3．C 第三段谈到该项研究的目的，即"examine the roles of genetic and environmental
factors…''
4．B 第四段明确指出，"they were related to smoking and s~ess in men and the use of
analgesics in women．"
5．B 从全文看，文章主旨在第一段即已提出，即"…lifestyle plays more of a role than
genetic factors in causing the illness．''
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