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注意：1.词数100左右；2.可以适当增加细节，以使行文连贯。

参考词汇：野生动植物摄影师wildlife photographer

Dear Mr. Smith, 

Yours,

Li Hua

I can remember the first time it happened. Class was getting out of hand. Our teacher, after quieting us six times as she tried to keep our 1  on the task at hand, finally gave up and informed we could take a rest. Instantly, the classroom erupted with students 2  their seats, laughing and talking.

And then there was me. I sat 3 in my chair. I finished the activity and then worked on a project, completely content. I didn't associate what I was doing with 4 behavior; I just had no desire to be loud and crazy.

As parents started to arrive, our teacher . 5 the chattering children with a half-hearted smile. But when my mother 6 ,she commented, "Your daughter is such a nice girl in class. She's a 7 ." And there it was: my first "nice".

Whether or not I knew it, a 8 had been set for my future behavior, though my teacher probably didn't mean it.

As years passed, I became9  in the art of nice. But as much as I loved praise, I was too 10  to dare be anything but nice.

People rarely see the Real Me, because the Real Me is 11 .She doesn't clean her room as often as she should. She's 12 at making decisions. Nice became a shelter I 13 my real feelings. "It's like living a. 14 life," I thought. I am 15 with being nice. I want to be the best of myself, not the nicest.

If you think you're a pessimist and there's no hope of ever turning it around, then think again! According to mental health experts, it is actually very possible to turn into a glass-half-full kind of person, and here's what you can do to see things in a brighter light.

 Writing down your ideas of an optimistic tomorrow will make a huge difference when it comes to your overall attitude to life. You may also want to consider a serious challenge you have in life right now, and simply sit back and think about all of the possible positive outcomes.

Choose to be optimistic. Life is all about choices. You can choose to spend the entire day reading or cleaning. You can make the call you've been thinking about for a while or you can put it off for another day. What's more, you can also choose to be positive or you can choose to simply carry on living as you are. And then carry on that way for the rest of your life.

Extend positiveness to others. Making others feel good about themselves can have lasting positive effects on your own life. Never forget to admire your family, friends, and colleagues for the good things which they are doing in their lives, even if they don't directly affect you.

Recognize your negative thought patterns. It's fine to acknowledge that bad things in life might happen at any time. Yet being overly negative can seriously ruin your chances of finding happiness in his life. Reframing your awkwardly negative thoughts into more realistic patterns may be the key to helping you maintain optimism.

Practice gratitude. Spend some time thinking about all of the things you have to be thankful for.  You could even choose to keep diaries, where you can put down anything which makes you smile. If nothing else, take a moment every once in a while to stop, smile and be thankful for the positive things in life.

A. Imagine a positive future.

B. Form the habit of keeping diaries.

C. Of course, it's also necessary to praise yourself.

D. Ignoring reality isn't the most helpful method either.

E. Being optimistic starts with the decision to be positive.

F. It will often provide you with an instant optimism boost.

G. Take a moment to work out how realistic your thoughts really are.

Starting in the mid-2010s, the success of streaming services like Spotify, Tencent and Apple Music led the music industry into a period of steady income growth. But the rise of streaming hasn't just transformed the business of music; it has changed the music as well.

In 1972, the Temptations hit number one on the Billboard Hot 100 charts, winning three Grammys, with a seven-minute version of the song "Papa Was a Rollin' Stone". Before the Temptations sing a word, an instrumental introduction plays for more than four minutes. If the group were in the studio today, the title chorus (副歌) would most likely have been featured much earlier in the song. That's because music streaming services pay artists based on the number of plays each month, and to count as a play, a user must listen to the song past the 30-second mark. If a song you've never heard before takes a long time to get to the hook (旋律最好的部分), there is a good chance that you may simply hit the button to go to the next song. To keep the "skip rate (跳过率)" as low as possible, musical artists are increasingly moving a song's hook to that initial 30-second sweet spot.

Every track that is listened to for more than 30 seconds counts as a play, but whether a listener makes it all the way through a song helps to determine whether a streaming service like Spotify will recommend similar songs in the future. For a musician, getting a song on Spotify's popular Today's Top Hits playlist means real money. A study by researchers at the University of Minnesota and the European Joint Research Centre found that songs on the list gained an average of 20 million streams, worth up to $163,000 in royalties (版税).

As a result, according to an analysis by blogger Michael Tauberg, the average length of hit songs has dropped by more than 30 seconds since 2000, when it was over four minutes. Nearly two-thirds of the songs that achieved the number one spot in the first half of 2021 were under three minutes long.

Using needles to deliver drugs has been common for more than a century. The past hundred years have seen all manner of medical advances, from life-saving medicine and X-rays to mRNA vaccines and special cancer treatments. Yet the needle has stayed mostly unchanged. Although now available in a variety of different sizes, it remains a hollow (having a hole or empty space inside), pointy tube.

With luck, that may soon change. As Yichi Ma, a scientist at the University of California, Berkeley, and his colleagues outline in a review paper, researchers around the world are looking for ways to ease the pain when needles go into the skin. Many have been inspired by nature.

The team got their idea from mosquitoes, which manage to get their blood meals without causing great pain to people. One reason is that the insects use painkilling chemicals when they first puncture(刺穿) the skin. But there is another reason. The point of a mosquito's saw-like proboscis(锯齿状的喙) is softer at its tip. The insect makes the skin of its target tight before biting, and shakes its proboscis as it pushes the proboscis in. All of this helps reduce the force needed to puncture the skin.

One paper, published in 2020 by a group of researchers in America and China, found that a mosquito-inspired needle required 27% less puncturing force than an ordinary one. And less force means less pain. Mosquito-inspired needles might also be useful for delicate procedures such as biopsies (the examination of tissue taken from a living body). A paper from the University of Michigan, also published in 2020, found that scientists could improve biopsies of tissue in some body organs. The lower force led to less movement of the organ itself, ensuring that the needles were guided accurately to the area that needed sampling.

For now, such devices remain limited to labs. But there is a big market for better needles. According to WHO, around 16 billion injections were given in 

2018. With one person in four saying they suffer from a fear of needles, the savings on stickers and sweets for the brave souls who roll up their sleeves would be considerable.