Earlier this year, China achieved a new milestone(里程碑) in space exploration(探索). On Jan 3, Chang'e 4 became the first space probe(探测器) in history to land on the far side of the moon, People's Daily reported.
    From Earth, we can only see one side of the moon. The other side has been a mystery. Scientists have long wondered what lies on this side of the moon.

    Chang'e 4 has sent back photos of the far side of the moon. It is also used to carry out experiments, such as growing seeds in a low-gravity(低重力) environment. The data(数据) collected from these experiments could be used to help us build a base on the moon in the future.

    The success of the Chang'e 4 mission(任务) is a main achievement for China's space program. It marks a new stage in China's deep space exploration, said Wu Yanhua, head of China National Space Administration.

    China launched(启动) its lunar(月球的) exploration program in 2004, naming it Chang'e. Chinese scientists set three goals —“orbiting(环绕运行), landing and sample(样本) returning”— referring to launching probes that could circle around the moon, touch down on its surface and bring lunar materials back to Earth.

    Chang'e 4 has realized the goal of landing. The third will be achieved during the Chang'e 5 mission, which is set to take place before the end of this year, China Daily reported.

    Following the success of the Chang'e missions, Chinese scientists are looking even farther into our solar system (太阳系). China's first Mars(火星) mission is expected to be carried out by 2020, Wu said.

    In most parts of the world, many students help their schools make less pollution. They join "environment clubs". In an environment club, people work together to make our environment clean.

    ●No-garbage lunches. How much do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the classes that make the least garbage and report them to the whole school!

    ●No-car day. On the no-car day, nobody comes to school by car—not the students or not the teachers! Cars give pollution to the air, so remember:

    Walk, jump, bike or run.

    Use your legs! It's lots of fun!

    ●Turn off the water! Did you know that some toilets can waste twenty to forty liters (升) of water an hour? In a year that would fill a small river! In environment clubs, students mend those broken toilets.

    We love our environment. Let's work together to make it clean.

     Robots seem very new to some people, but in fact they have a long history. The first robot was made by a Greek inventor(发明家). You may often see robots in lots of movies. The robots in the movies are stronger, faster and cleverer than people. In real life, most robots are used in factories. They are used to do many dangerous, difficult or boring jobs. Some people can't look after themselves and robots are used to help them. For example, some people can't see. They use dogs to help themselves move around. These dogs are called guide dogs. Scientists are making robots to help them. In the future, robot dogs might take the place of these guide dogs.

    Robots are also used in American hospitals. At one hospital, a robot takes meals from the kitchen to the sick people's rooms. It never loses its way because it has a map of the hospital in its computer system(系统).

In the future, robots will work in space. Robots will never take the place of humans, though they can help us in a lot of different ways.

Scientists say they recently invented the world's tiniest remote—controlled robots. The robots are small enough to sit on the side of a coin. They don't have any power of their own，and they can be controlled from a distance by using lasers（激光器）. The scientists say one day robots like these may be able to work in areas too small for tools. The robots don't move very quickly. But because of their tiny size，they're also not too slow. It takes the robots about 20 seconds to cover 1 centimeter. 

Right now the robots aren't all that useful. All they can do is to move，and they need to be in a place where lasers can shine on them to do that. But the scientists say these robots are an important step toward inventing more helpful tiny robots. 

The researchers say that one day tiny robots like these might be able to work in very small spaces. It's possible that they could build very tiny machines，or perhaps even travel inside the human body to help do with medical problems. 

Using similar building methods，the scientists made a number of different robots，including ones that looked like small insects. John Rodgers，says that their methods allow them to "build walking robots with almost any sizes or 3 D shapes. "

According to the Chinese lunar calendar* , 12 animals mark 12 different years-rat, ox, tiger, rabbit, dragon, snake, horse, sheep, monkey, rooster, dog and pip. Your year of birth decides your zodiac. Some people believe that people born under the same zodiac share similar characteristics*. Here are some zodiac signs and their characteristics. 

The ox is the second animal in the Chinese zodiac. In one folk story(民间传说), all of the animals held a race to choose the 12 animals of the zodiac. The ox was in the first place. But it didn't see a rat on its back. When the ox was close to the finishing line, the rat jumped down and became the winner!It is believed that people born in the Year of the Ox are patient and hard-working! But they can be stubborn* sometimes. 

It is said that people born in the Year of the Dragon are creative, confident, outgoing and quick-tempered(性急的). They also like to help others. They're warm-hearted so that they may have many friends. 

Chinese people believe that those who are born in the Year of the Rooster are active. They also like to be the center of attention and always look beautiful. They are the happiest when they are surrounded by others, whether at a party or just around friends.