3 . Researchers in the psychology department at the University of California at Los Angeles (UCLA) have discovered a major difference in the way men and women respond to stress. This difference may explain why men are more likely to suffer from stress-related disorders.

Until now, psychological research has maintained that both men and women have the same “fight-or-flight“ reaction to stress. In other words, individuals either react with aggressive behavior, such as verbal or physical conflict (“fight”), or they react by withdrawing from the stressful situation (“flight”). However, the UCLA research team found that men and women have quite different biological and behavioral responses to stress. While men often react to stress in the fight-or-flight response, women often have another kind of reaction which could be called “tend and befriend. ” That is, they often react to stressful conditions by protecting and nurturing their young (“tend”), and by looking for social contact and support from others—especially other females (“befriend”).

Scientists have long known that in the fight-or-flight reaction to stress, an important role is played by certain hormones (激素) released by the body. The UCLA research team suggests that the female tend-or-befriend response is also based on a hormone. This hormone, called oxytocin (催产素), has been studied in the context of childbirth, but now it is being studied for its role in the response of both men and women to stress. The principal investigator, Dr. Shelley E. Taylor, explained that “animals and people with high levels of oxytocin are calmer, more relaxed, more social, and less anxious.” While men also secrete (分泌) oxytocin, its effects are reduced by male hormones.

In terms of everyday behavior, the UCLA study found that women are far more likely than men to seek social contact when they are feeling stressed. They may phone relatives or friends, or ask directions if they are lost.

The study also showed how fathers and mothers responded differently when they came home to their family after a stressful day at work. The typical father wanted to be left alone to enjoy some peace and quiet. For a typical mother, tackling a bad day at work meant focusing her attention on her children and their needs.

The differences in responding to stress may explain the fact that women have lower frequency of stress-related disorders such as high blood pressure or aggressive behavior. The tend-and-befriend regulatory (调节的) system may protect women against stress, and this may explain why women on average live longer than men.

6 . We were five minutes into a severe winter storm — approaching Boston’s Logan International Airport when I turned to the woman next to me and said, “Hey, would you mind chatting with me for a few minutes?” My seatmate seemed friendly and I suddenly felt desperate for a human connection.

“Sure. My name is Sue,” the woman replied, smiling warmly. “What brings you to Boston?” I started to explain that I was on a business trip. Then the plane trembled violently, and I blurted out, “I might need to hold your hand too.” Sue took my hand in both of hers, patted it, and held on tight.

Sometimes a stranger can significantly improve our day. A pleasant meeting with someone we don’t know, even an unspoken exchange, can calm us when no one else is around. It may get us out of our own heads — a proven mood lifter — and help broaden our vision. Sandstrom, a psychologist and senior lecturer at the University of Essex, has found that people’s moods improve after they have a conversation with a stranger. And yet most of us resist talking to people we don’t know or barely know. We worry about how to start, maintain, or stop it. We think we will keep talking and disclose too much, or not talk enough. We are afraid we will bore the other person. We’re typically wrong.

In a study in which Sandstrom asked participants to talk to at least one stranger a day for five days, 99 percent said they had found at least one of the exchanges pleasantly surprising, 82 percent said they’d learned something from one of the strangers, 43 percent had exchanged contact information, and 40 percent had communicated with one of the strangers again.

You don’t even have to talk to complete strangers to obtain the benefit. Multiple studies show that people who interact regularly with passing acquaintances or who engage with others through community groups, religious gatherings, or volunteer opportunities have better emotional and physical health and live longer than those who do not. One person took up the cell phone after chatting with a woman on the subway who was carrying one. Another recalled how the smile of a fruit salesman from whom he regularly bought bananas made him feel less lonely after he’d first arrived in a new city.

When Sue took my hand on that scary flight to Boston, I almost wept with relief. “Hey, this is a little bumpy, but we will be on the ground safely soon,” she told me. She looked so encouraging, and confident. I asked her what she did for a living. “I’m a retired physical education teacher, and I coached women’s volleyball,” she said. Immediately, I could see what an awesome coach she must have been.

When we said goodbye, I gave Sue a big hug and my card. A few days later, I received an e-mail with the subject line “Broken hand on Jet Blue.” “I have to admit that I was just as scared as you were but did not say it,” Sue wrote. “I just squeezed your hand as hard as I could. Thank you for helping me through this very scary situation.” She added that when she’d told her friends about our conversation, they teased her because they know she loves to talk. I told my friends about Sue too. I explained how kind she was to me, and what I learned: It’s OK to ask for help from a stranger if you need it. Now if I mention to my friends that I am stressed or worried, they respond, “Just think of Sue!”

8 . Sitting back in my seat, I can’t quite believe that I’m about to travel along the railway that many foreign experts claimed was “impossible”. The train has been racing along steadily since it left Xining. All this time, the song “Sky Railway” has been_________inside my head. The words “railways like massive dragons are winding among the mountains” seem particularly_________as I travel across the “roof of the world”.

I was one of the people who came from all parts of China to work on this railway._________years to complete, the Qinghai-Tibet Railway is a record of all of our efforts to_________the most difficult engineering challenges. How to_______the delicate ecosystem was among the top concerns.

The first_________to catch my eye is the splendid Qingshuihe Bridge, the world’s longest bridge built over permafrost. Look! A group of Tibetan antelopes is moving under the bridge, with some stopping to eat grass at their_______. Thirty-three passages have been built under the railway to allow the animals to move safely and freely in their natural_________. Wild animals such as these Tibetan antelopes have now been using these_________for years. They seem totally__________that we are speeding past at over 100 kilometres an hour.

To prevent__________to wetlands and grasslands, 675 bridges with__________about 160 kilometres were built between Golmud and-Lhasa. We even moved 140,000 square metres of wetland to a new area in order to protect its distinct ecosystem.

The journey has been flying by, and before I know it, we have reached Tanggula Station.__________at over 5,000 metres above sea level, this is the__________railway station in the world. In locations such as this, the thin air,__________weather and high levels of UV radiation presented perhaps the greatest__________ for railway workers. To make sure we stayed__________, several oxygen-making stations were constructed. We were also able to enjoy__________breaks in lower areas.

As we pass Cuona Lake, I feel a sense of pride and achievement. Using thousands and thousands of sandbags, we built a twenty-kilometre wall along the lake to protect it from construction waste. Cuona Lake is so close to the railway that I want to__________and touch its pale blue mirror-like surface. Water birds playing in the lake, and cattle and sheep wandering the grasslands bring the scenery to life.

The Qinghai-Tibet Plateau has been attracting people’s admiration for centuries. Now, thanks to our efforts, passengers from all over the country have been enjoying these magical landscapes. I am proud that we built our “impossible” railway, and did so with the care that the environment__________. It truly is an extraordinary “Sky Railway”.

10 . We say that technology is a double-edged sword—while it brings convenience, it also brings new problems. The sword of “social media” even has a gender preference in its damage. It cuts deeper into girls than boys.

Earlier studies have shown that spending too much time on social media is bad for teenagers’mental health. Constantly watching their friends show off “perfect” lives can hurt their own self-esteem. That’s not to mention the problems caused by online shaming and bullying.

Jean Twenge, a professor at San Diego State University in the US, recently discovered an alarming trend: Since 2010, the number of teenage girls who suffer from major depression—showing signs like self-harm and suicide—has increased much faster than that of boys. In an article she wrote at The Conversation, Twenge said social media, again, was to blame.

For starters, girls use social media more than boys. Boys tend to spend their screen time on games, where they talk to their teammates through headphones. This counts as real human contact. Girls, however, simply type and browse through posts, which is a much isolated experience. “They’re not having a real-time conversation with someone,” Mary Fristad, psychologist at The Ohio State University, told NPR.

And when it comes to online shaming, girls are also more vulnerable than boys. “Girls face more pressure about their appearance, which could be exacerbated (加重) by social media,” wrote Twenge.

Shannon McLaughlin, for example, is an 18-year-old from Blackburn College in the US. She shared with the Guardian how social media made her feel depressed. “I was constantly confronted by women with skinny bodies who were praised for the way they looked. This was only made worse by the diet fixes and skinny culture,” she said. But McLaughlin found a solution. She started volunteering with the National Citizen Service, where she made face-to-face contact with people. “It's so easy to forget the importance of real connections when we have hundreds of people that we’re trying to impress at our fingertips,” she told the Guardian. And she hopes that others “look up from their phones and focus more on the world around them”.