Using social media too much and posting many selfies （自拍照)have caused a rise in narcissism，according    1     a new study.Narcissism is when someone becomes very self-centred and believes they are quite attractive.They want attention and likes from other people and think they are    2     ( good) than everyone else.Researchers at universities in Swansea and Milan studied how 74 people aged 18 to 34 used social media and    3     (look) at how their personality(性格〉changed. The researchers found that those    4     used social media    5     ( heavy)through posting selfies showed an average 25% increase in narcissism over the four months of the study.

Professor Phil Reed，from the Department of Psychology at Swansea University，said:“There have been    6     (suggestion) of connections between narcissism and the use of selfies on social media but    7     was not known if using social media was connected with narcissism until this study.The results of this study suggest that posting selfies can increase narcissism. Professor Reed said that about 20 per cent of people may be at risk of    8     (develop)narcissism. This is because they want     9     (get) attention from other people after they post a selfie and show others how    10     (they) life is better or how they are more attractive.

2 . I've discovered the joy of a new thing. Online grocery shopping. But I actually enjoy going to the supermarket.

Seems I'm not the only one，only about 3% of people do grocery shopping online，compared with around 30 % who shop for clothes and electronics. I was interested，so I decided to do my own very unscientific research.

Step one: I talked to a small group of friends about their preferences.One mother described it as the happiest thing in her week when she was stuck at home with two small kids and handsome young men would arrive at the door bearing groceries.Seems busy mums are very much in favour of home deliveries(送货).

Step two: sign up and try it myself. My choice was Aussie-owned Countdown.

I managed to do the whole shop in about 15 minutes. The only problem is that you have to place an order of at least $ 50 and pay the seemingly standard $ 15 delivery fee. But given the cost of groceries，who has ever left a supermarket spending less than $ 50? l was impressed Countdown offered same-day delivery on a Sunday when I placed my order at 9:30 am.

Sure enough，at about 2:30 pm，I got a phone call from a delightful courier chap（快递员)called Ian，who told me he was at my house with the groceries and was leaving them on the back deck. Two minutes later he called again saying he'd left the groceries in the house because we'd left the backdoor wide open.He even offered to lock the house up and put the key some where safe.

I have a real fear that we will more and more quickly move to online shopping for everything and shops will become something of the past.

As a teenager，hanging around the shops on a Saturday with friends is what we did.So even though I enjoy the experience of online grocery shopping，perhaps I'll just stick with my regular trips to my local New World to keep real shops alive a bit longer.

3 . In the United States，many teachers keep fish，hamsters(仓鼠)，and other animals in their classrooms.Teachers say students learn important lessons from the animals.More than 70 percent of teachers who have classroom pets say the animals help students learn responsibility.Research also shows that classroom pets can reduce stress.

“Pets can comfort kids who are having a bad day,”says Lisa Robbins，who works fora group called Pets in the Classroom.

But others think pets should be expelled from classrooms. In January，the Durango School District in Colorado began following a no-pet policy(政策).Now animals can be brought into Durango schools for certain lessons，but they can't stay.Officials were worried that animals might create problems for kids with allergies(过敏症).They were also concerned about the animals getting proper care.

Here's what two of our readers think.

Having classroom pets gives students a fun way to learn about animals. In my class last year，we had a class pet named Elliot.Our teacher also used him to teach us about different subjects.For example，in math，we calculated (计算)how much it costs to feed Elliot for a year.

If teachers are worried about students with allergies，they could get pets that don't have fur.

—D' Lasia Mays，Texas

Classroom pets can take away valuable class time.Some students might have a hard time focusing on the teacher when there are animals in the room.

Plus，having a classroom pet can cause safety problems. You never know how an animal will react to students.Even a cute little hamster might hurt a kid who sticks his or her hand in its cage.

—Patrick McKinney，Ohio

4 . There is a change of attitude toward the pink and blue divide in toys. Target, the second—largestdiscount retailer(折扣零售店)in the US, announced in 2015 that it would get rid of signs labeling(标记) toys for boys or for girls. A UK campaign called Let Toys Be Toys seeks to get retailers to stop dividing toys and books for one gender(性别)only.

Researchers have worried about the effect of having toys that were sosegregated(分开的) by gender for sometime, says Lisa Dinella, associate professor at Monmouth University.

Clearly divided pink and blue toys—with dolls and tea sets on one side and trucks and building blocks on the other—are actually a pretty recent development. As recently as the 1970s, toys sold in the US were not always marketed with clear gender distinctions. By the 1980s and 1990s, however, toys started to become more gender segregated, though it was still not so sharply divided as today, says Elizabeth Sweet, a lecturer in sociology at the university of California, Davis.

While it may seem like a small issue, toys help children to develop new skills, says Dinella. Dolls and pretend kitchens are good at teaching kids early language skills. Building blocks like Lego and puzzles teach skills related to space, which help set the groundwork for learning math. “Both genders lose out if we put kids on one track and they can't explore” says Dinella.

Some parents try to introduce other types of toys and get away from the strictly pink and blue divide. But it's difficult for parents to ignore the marketing and get their kids toys or costumes meant for the other gender, says Dinella. While some parents try to broaden the toys their children are ex—posed to, there is often a social cost to the child for crossing gender boundaries. “So it is hard for parents to throw out the rules,” she says.

Researchers hope that one day, toys will stop being broken up by gender and will instead be categorized by type, like puzzle toys, dolls or children's bikes. Toy choices, Sweet says, should be based on kids’ personal interests, and not on their gender.