Australia is the smallest continent in the world. It is a little smaller than China. It is on the Southern Hemisphere of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai.

    Enough laws have been made to fight against pollution. The cities in Australia have little air or water pollution. The sky is blue and the water is clean. You can clearly see fish in the rivers. Plants grow very well.

    Last month we visited Perth, the biggest city in Western Australia, and went to a wild flower exhibition. There we saw large numbers of wild flowers on show, most of which we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. Every year in spring Perth has a wild flower exhibition. After visiting Perth, we spent a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves very much. When we heard bells ringing at the top of the hills, we looked up, but what we saw made us pick up all our things and run back to our car as quickly as we could. There were about three hundred sheep coming towards us along the path.

    Australia is famous for its sheep and kangaroos. After a short drive from any town, you will find yourself among the white sheep. Sheep, sheep, everywhere you can see sheep.

    How fit are your teeth? Are you lazy about brushing them? Never fear: An inventor is on the case. An electric toothbrush senses how long and how well you brush, and it lets you track your performance on your phone.

    The Kolibree toothbrush was exhibited at the International Consumer Electronics Show in Las Vegas this week. It senses how it is moved and can send the information to an Android phone or iPhone via a Bluetooth wireless connection.

    The toothbrush will be able to teach you to brush right (don't forget the insides of the teeth!) and make sure you're brushing long enough. “It's kind of like having a doctor actually watch your brushing on a day-to-day basis,” says Thomas Serval, the French inventor.

    The toothbrush will also be able to talk to other applications(应用) on your phone, so developers could, for example, create a game controlled by your toothbrush. You could score points for beating monsters(怪物) among your teeth. “We try to make it smart but also fun,” Serval says.

    Serval says he was inspired by his experience as a father. He would come home from work and ask his kids if they had brushed their teeth. They said “yes,” but Serval would find their toothbrush heads dry. He decided he needed a brush that really told him how well his children brushed.

    The company says the Kolibree will go on sale this summer, for $99 to $199, depending on features. The U.S. is the first target market.

    Serval says that one day, it'll be possible to replace the brush on the handle with a brushing unit that also has a camera. The camera can even examine holes in your teeth while you brush.

    Welcome to our school. You can do a lot of things here. Come and join us.

    Robots and humans will soon be living in harmony(和睦).A singing robot is being taught to create jazz with a human in a project.

    Antonio Chella from Italy is working with a Telenoid robot. To start with, the Telenoid will be trained to follow the movements and simple sounds made by a human singer, and to connect music with different emotional states. Chella then plans to see if the robot can use these connections to create music.

    Intelligence is often regarded as the ability to find connections between the existing things. But Chella suggests that a conscious(有意识的) creature should be able to go a step further and introduce new connections that result in the creation of something new.

    Some jazz musicians say that they should have a mental library of musical phrases so that they are able to combine them in new ways. More importantly, however, this combination happens in a state that is similar in a sense to dreaming. Chella wants to copy these states in a machine.

    “This work raises interesting questions about the link between consciousness and music making,” says Philippe Pasquier, a musician and computer scientist. But he is skeptical about whether a robot musician needs a physical body.

    Pasquier argues that the robots are faced with two challenges(挑战). Software that can copy Bach has already been developed. But interpretation（演绎）includes human's different tastes and judgments. “What made the Beatles famous was not so much their works, but the fact that the interpretations of the works were wonderful,” he says.

    It is not yet clear how a robot would go about interpreting music in a new way. But by copying humans and then learning to sing, Chella's robot could provide clues.

    What seems to be important is that human composers often listen to lots of music made by others. So Chella's robot had better listen to those jazz standards first.

    "You know, the soft subjects," says the boy in maths. "The easy ones: the stupid girls at the bottom take them. Like dance. It shouldn't even be a subject." We're choosing subjects for our A-level taster day at school. I see the raised eyebrows (眉毛) when I explain two of my GCSE (General Certificate of Secondary Education) choices are dance and drama(戏剧).

    I was told by advisers that dance and drama wouldn't help me to get a suitable career. My friends told me I'd get bored of dance and switch to science within the first month.

    But taking GCSE dance was the best decision I ever made. Dance gives me something to pour my head and heart into. It gives me a feeling of belonging, creativity, security and freedom.

    The education secretary Nicky Morgan has put emphasis on (强调) science, technology, engineering and maths (STEM), saying that students who focus on the arts risk their careers. Stopping young people from expressing themselves at such a young age is not doing them any favours. Perhaps Nicky Morgan has forgotten to open the door of having a drive to study that subject day in, day out. It shouldn't matter what that subject is.

    I don't doubt the influence that STEM subjects can have on the people that love them. But to force children into one field is cruel. As much as I try, I'm not good at and don't love physics, biology or maths. I don't want a career in these areas.

    There has been a decrease in the number of state schools offering arts subjects taught by specialist teachers. I can't even imagine how it feels to be told that you don't teach a "real subject" by an 8-year-old boy.

    To the teachers, the parents, the government I say: Let children make their own decisions. Let them live in the present. Let them have a real, unlimited education.

Online activity can be riddled with cyberbullying (网络霸凌). To find out which app is the best to keep your kids safe online, we tested four apps over five weeks. ● Mobicip Premium

$8 per month (billed annually at $96) for 20 managed devices at Mobicip

Mobicip Premium's social media and screen time monitoring were all strong. We found its app blocking, website content monitoring, and location tracking capabilities to be powerful as well. ● Net Nanny

$90 per year (billed annually) for 20 managed devices at Net Nanny

The user interface (界面) of this app is family-friendly and visually engaging, featuring cartoons of parents and casual language. The web filtering, screen time allocation (分配), and app management functions are all capable. ● OurPact Premium+

$100 per year (billed annually) for 20 managed devices at OurPact

This app requires that we pair our child's device to our computer with a cable and download the OurPact Jr. app. The Screen Time capability is personalized to fit our child's schedule. ● Qustodio Premium Small

$55 per year (billed annually) for 20 managed devices at Qustodio

The thoughtfully designed web interface makes Qustodio Premium Basic easy to operate. Its web filtering and game blocking features were powerful. This app is available for Android, Chromebook, iOS, Kindle, macOS and Windows, though not all features are supported across all platforms.