D. have fewer amounts of cortisol in their systems
3. The underlined word “stymied” in Paragraph 3 probably means “________”.
A. taken away
B. held back
C. cheered up
D. turned down
4. What is the author’s attitude towards the blood test research?
A. Objective.
B. Passive.
C. Cautious.
D. Doubtful.
答案与解析
【文章大意】
研究人员取得科研突破:通过验血能预测人们是否具有自杀倾向,从而防止更多悲剧发生。
1. 答案
D
解析
细节理解题。根据第一段A blood test that can predict whether someone may attempt suicide has been developed by scientists in a breakthrough which could prevent hundreds of deaths.可知,通过验血来预测人们是否具有自杀倾向,从而防止更多悲剧发生。故选D项。
2. 答案
B
解析
推理判断题。根据第二段中American researchers have found that variations in a single gene can be used to predict if someone is likely to take his own life.以及If there isn’t enough SKA2, or it is changed in some way, the body cannot control levels of cortisol. Previous research has shown that people who attempt suicide or who take their own lives have large amounts of cortisol in their systems.可知,通过验血可以检查一种基因是否发生变异,若体内SKA2基因含量不足,或以某种方式发生变化,人体将无法有效控制皮质醇含量。此前的研究发现,自杀或有自杀倾向的人体内皮质醇含量较高。由此可推知有自杀倾向的人的基因SKA2发生变异。
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