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听力文本：
Ever won the lottery? No? But did that stop you buying another lottery ticket? If the answer is another "no", you might call yourself an optimist.
你中过彩票吗？没有？但是这阻止你继续买彩票了吗？如果答案是否定的，那你或许应该称呼自己是乐天派。
But according to researchers at University College London, human beings are naturally hopeful creatures.
但是根据英国伦敦大学学院的研究人员的研究发现，满怀希望是人类的天性。
It is all in the brain, they say.
他们说这完全是因为我们的大脑。
A study suggests it is very efficient at processing good news:
一项研究发现，大脑在处理好消息时十分高效：
about 80% of people have a tendency to see the glass as half-full, not half-empty, even if they don't consider themselves to be optimists.
80%的人会选择看事物的光明面而不是阴暗面，尽管他们可能不认为自己是乐观派。
The good news is that this brings a health benefit.
好消息是这对健康有益。
Being upbeat and having a positive outlook on life reduces anxiety.
乐观积极的生活态度可以降低焦虑感。
A study of nearly 100,000 women showed a lower risk of death from heart disease amongst optimists.
一项对10万名乐观女性的调查显示她们患心脏病的概率更低。
But it's not always good to be optimistic.
但是乐观不一定总是好事。
The authors of the study point out the 2008 financial crisis may have been caused by analysts overestimating their assets' performance even in the face of clear evidence to the contrary.
该项研究的发起人指出，2008年的金融危机的罪魁祸首可能是资产分析师。他们过高估计资产，尽管当时已经有证据表明他们是错的。
There are personal health risks too.
乐观还有可能威胁个人健康。
Dr. Tali Sharot, lead researcher, said: "Smoking Kills' messages don't work because people think their chances of having cancer are low.
首席研究员塔利·夏洛特博士说：‘吸烟有害健康’的警告根本起不到作用，因为人们认为自己得癌症的几率很低。
There's a very fundamental bias in the brain.”
人们的大脑本能地偏爱好的事情。
But, as they say, every cloud has a silver lining.
但是，俗话说，祸兮福所倚。
Even if seeing the world through rose-tinted glasses poses a risk to our health, we've not going to skip sleeping.
就算我们处世积极，我们也不用担心到夜不能寐。
Let's just keep our chins up and keep smiling!
让我们昂首挺胸，保持微笑吧！
Questions 23 to 25 are based on the passage you have just heard.
请根据刚听到的短文回答23-25题。
Question 23. What did researchers at University College London recently find?
23.英国伦敦大学学院的研究员最近有什么发现？
Question 24. What do the researchers mention the 2008 financial crisis for?
24.研究者们为什么提起2008年的金融危机？
Question 25. What does the speaker suggest people do?
25.说话者建议人们怎么做？
