①If a stranger asks for using your phone, would you help? What if a person wants to borrow thirty yuan for a meal, saying he will return and pay you back later?
②Some of you may choose to trust them and offer your help. There are two main ideas to explain why some people trust others more easily. One idea says that trust is a lasting quality. It has a relationship with early life experiences. If a child always sees parents keeping promises, he/she often trusts others easily. The other idea shows how a person's social environment experiences affect trust. For example, if someone asks you, "Do you think we can trust most people in the society?", your answer might depend on whether you were stolen yesterday or if someone gave back your lost wallet.
③ However, a new study shows that our ability to trust strangers may be more than just a social habit—it could be part of our DNA. This is important because the study also found that people who trust others may live a longer and healthier life than those who often question others.
④Professor Edgerton's team studied about 34,000 people and found a gene(基因) called PLPP4 that connects with trust. They found out PLPP4 works like biological rules and this gene changes how our brain acts around strangers.
⑤Scientists believe PLPP4 may work by changing our brain's danger warning system. Usually, meeting strangers wakes up this system automatically(自动地), making us ready to run away or fight. But PLPP4 seems to take the sting out of this alarm, making us feel calmer around new people. This biological difference helps explain why some people naturally trust strangers more easily than others.
⑥ This genetic effect could be good for health. When our brain's alarm system stays calm, we experience less stress. This natural trust through PLPP4 might reduce the risks of heart illness. Understanding how genes shape trust could help build a healthier world.
()62. What might affect people's trust according to the two main ideas in Paragraph 2?
A. Childhood habits.
B. Personal abilities.
C. Life experiences.
D. Communication skills.
()63. The words "take the sting out of this alarm" in Paragraph 5 probably mean "".
A. turn off the safety system
B. get out of the difficult situation
C. increase the level of danger
D. reduce the feeling of being afraid
()64. What is the structure according to the passage?
A. ①/②/③④⑤⑥
B. ①/②③/④⑤⑥
C. ①②/③④/⑤⑥
D. ①②③/④⑤/⑥
()65. What is the writer's main purpose(目的) in writing this passage?
A. To show different opinions on how trust is formed.
B. To show the advantages of trusting others in daily lives.
C. To explain why some people find it hard to trust strangers.
D. To report a new study on how genes affect trust and health.

D [文章大意]本文是一篇说明文。文章首先介绍了两种影响信任的传统观点,即早期生活经历与社会环境经历;接着引出一项新研究的结果表明PLPP4基因会影响大脑的危险预警系统,进而影响人信任他人的能力;最后阐述了该基因对降低压力、减少心脏病风险的积极作用。
62.C [解析]细节理解题。根据“One idea says that trust is a lasting quality ... early life experiences. ”和“The other idea shows how a person’s social environment experiences affect trust. ”可知,两种观点分别提到早期生活经历和社会环境经历,均属于“生活经历”范畴。故选C。
63.D [解析]短语猜测题。根据“But PLPP4 seems to take the sting out of this alarm, making us feel calmer around new people. ”可知,PLPP4基因的作用是减弱大脑警报系统所带来的紧张感,使人更平静。故选D。
64.A [解析]篇章结构题。通读全文可知,第一段:提出问题(如果陌生人求助,是否会提供帮助);第二段:传统观点(生活经历影响信任);第三段到第六段:新研究(基因PLPP4影响信任他人的能力和健康),结构为“引入问题→旧观点→新研究”。故选A。
65.D [解析]写作意图题。根据“a new study shows that our ability to trust strangers may be more than just a social habit—it could be part of our DNA”以及下文对基因PLPP4的详细说明可知,本文重点报道基因如何影响信任他人的能力与健康。故选D。