四六级

　　自2016年起，英语四级听力改革，将考试题型改为：3篇短新闻、2篇长对话和3篇短文。小编将为大家提供新题型的模拟练习题，这是四级听力在线听练习题第3套短文3，希望能更好地帮助大家进行2017年6月英语四级备考。

四级听力在线听练习题第3套短文3.mp3

　　Questions 23 to 25 are based on the passage you have just heard.

　　23

　　A.Exposing skin to sunlight will certainly lead to skin cancer.

　　B.UV rays can help lower people's blood pressure.

　　C.Heart attacks and stoke are linked to low blood pressure.

　　D.Bathing in the sun helps build people's mental health.

　　24

　　A.Vitamin D

　　B.UV rays.

　　C.Body temperature.

　　D.Blood pressure.

　　25

　　A.Heart rate.

　　B.Vitamin D levels.

　　C.Body temperature.

　　D.Blood pressure.

　　Passage Three

　　The health benefits of exposing skin to sunlight may far outweigh the risk of developing skin cancer, according to scientists. Edinburgh University research suggests sunlight helps reduce blood pressure, cutting heart attack and stroke risks and even prolonging life. UV rays were found to release a compound which lowers blood pressure. Researchers said more studies would be carried out to determine if it is time to reconsider advice on skin exposure. Heart disease and stroke linked to high blood pressure are estimated to lead to about 80-times more deaths than those from skin cancer in the UK. Production of the pressure reducing compound is separate from the body's manufacture of vitamin D, which rises after exposure to sunshine. Researchers said that until now vitamin D had been thought to solely explain the sun's benefit to human health.

　　During the research, researchers studied the blood pressure of 24 volunteers under UV and heat lamps. In one session, the volunteers were exposed to both the UV rays and the heat of the lamps. In the other, the UV rays were blocked so that only the heat of the lamps affected the skin. The results showed that blood pressure dropped significantly for one hour following exposure to UV rays, but not after the heat-only sessions. Scientists said that this suggested it was the sun's UV rays that lead to health benefits. The volunteers' vitamin D levels remained unaffected in both sessions. The study will be presented in Edinburgh at the world's largest gathering of skin experts.

　　23. What can be learned from Edinburgh University's research?

　　24. What was thought to be the only element to explain sun9s benefit to human health?

　　25. Which element is said to be unaffected in the research?

　　参考答案：

　　【小题23】B

　　【小题24】A

　　【小题25】B

　　习题解析：

　　【小题23】短文指出，根据爱丁堡大学的最新研究，日常照射可以降低血压，减少心脏病和中风发作的可能，甚至可以延长寿命，这是因为UV rays were found torelease a compound which lowers blood pressure.即UV光有助于降低人们的血压。因此答案为选项B。

　　【小题24】短文中明确提到Researchers said that until now vitamin D had been thought to solelyexplain the sun's benefit to human health.即之前维生素D是能解释阳光对人体健康益处的唯一要素，因此答案为选项A。

　　【小题25】短文中明确提出The volunteers' vitamin D levels remained unaffected in both sessions. 也就是说，不管是经过UV光线的照射，还是经过了热量灯的照射，接受实验的志愿者们体内的维生素D含量都没有变化。因此答案为选项B。

　　以上就是四级听力在线听练习题第3套短文3的全部内容，希望大家勤加练习，预祝大家顺利通关2017年6月英语四级考试！

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