相关试卷

There are many sources of debate on a long road trip, including route selection, the choice of snacks, and, probably most importantly, what to play on the radio. Finding a way for all parties to listen to their own audio without the need for headphones has been a goal of car makers for decades and scientists may have finally managed it. 

A team from the University of Le Mans in France carefully positioned microphones, speakers and filters（过滤器）to create personalised sound zones(PSZs) inside a car, and the small regions are where sound from a set of speakers can be heard clearly. Outside these, it cannot be heard. 

One barrier which scientists have previously been unable to overcome was the impact of moving one's seat. They were able to form a PS2, but unable to move it to follow a person if they moved the seat forwards or backwards.

The French team created a new algorithm（算法）specifically to tackle this issue, which handles the sound waves to create "bright" and "dark" zones in the car. "Loudspeakers are placed in the headrests. and specific filters for each transducer（换能器）are calculated to reproduce a sound signal that maintains good quality in the zone under consideration and is strongly weakened in other zones. " said. Dr Lucas Vindrola, the author of the study. "The key to the technique working properly is having sufficient microphones placed around the car to detect how many people are in the car and where they are sitting. The price to pay is to have control microphones in the passenger section, so that the algorithm can work. "

However, the technique is not yet ready to be commercially rolled out as a luxurious optional extra just yet, as it currently works only for a limited range of frequencies. 

On the outside, 12-year-old Luna seems like your average kid. It's not until you get to know her that you learn that Luna is anything but average.

Born with a heart defect（缺陷）called dextrocardia, Luna has had three open-heart operations and continues to pursue her interests in art and fashion. But when Luna was approached by athletic shoe company Saucony to design a shoe for sale across the country, it came as quite a surprise. 

"This is so incredible. I got to use my art and creativity for something new that I'd never thought I'd be able to design, "Luna said. She is one of six patients from Boston Children's Hospital(BCH) who have partnered with Saucony to design their own shoe to launch the Shoes with Soul campaign.

"Rather than just a donation, we wanted to create an experience and a moment that would not only raise money, but also awareness to high light all the amazing work that's being done at BCH, " says Chris, Saucony's vice president. "Specifically, we wanted to give some of the BCH kids an opportunity to share their story and their talents with the world. "

Luna's design is fashion. "On the tongue, they digitalized one of my drawings, and then on bottom it's a really bright pink color, and on the inside, the sole of the shoe is actually another drawing I did of a sunset, " she said. "Thinking about kids everywhere around the world wearing my shoe is amazing. It blows my mind. "

The income from the shoe sales will benefit the Boston Children's Hospital Cardiac Fitness Program, which encourages kids to "find your possible" through personalized exercise programs tailored for each individual patient's heart condition.

"It feels really good to help people and it's really something I can relate to, " says Luna. "The advice I would give a kid or someone like me is never give up. There are a lot of kids out there with your condition and you're not alone. "

Best Education Apps for Android

Mobile technology, which is one of the most revolutionary productivity tools of all time, is an amazing way to help further your education. You can use your smartphones and tablets to help teach yourself new skills and learn new things. Here are some of the best education apps for Android. 

SoloLearn

Price: Free

SoloLearn has tons of education courses on computer programming. All of them teach you a computer language. There is a range of languages available, including Python, Java, C++ and even JavaScrip. If you're into computer programming at all, you should look into these.

Quizlet

Price: Free

Quizlet is arguably the best flashcards app out there. You can use it for virtually any topic. You can practice terms for your class, memorize vocabulary terms, and more. It also includes foreign language support, images and audio, and you can share flashcards with friends. 

EdX

Price: Free

EdX offers courses from actual colleges, including computer programming, engineering, history, psychology, nutrition, statistics, and hundreds of others. It features online or off line video lectures, course announcements and handouts, and various tutorials. Anyone looking for higher education should have this app right now. 

Khan Academy

Price: Free

Khan Academy is another education platform. It currently boasts over 10, 000 instructional videos, classes, and other content. It deals with more typical education, such as mathematics, economics, history, science, and more. There is also a version specifically for younger kids and we highly recommend that one as well. 

If we missed any of the best education apps for Android, tell us about them in the comments. You can find our latest app lists by referring to the link here. 

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.