【推荐1】Venus (金星) is close to Earth.     1       Earth is the third planet from the Sun. Venus is similar to Earth in size and mass (质量). It is often described as Earth’s “sister”.

Scientists have been learning about Venus for a long time. First, they looked at Venus through telescopes (望远镜). But Venus is covered with thick clouds.     2     So, they made guesses about it.

For a long time, scientists thought that Venus had water and plants. They thought Venus might have animals, too.     3    

    4     In the 1960s, they began sending probes (航天探测器) to Venus. The probes flew through the thick clouds. They took pictures of Venus up close. They found out many things, too. The probes sent the pictures and things they found out back to the scientists.

    5     First, they learned that most of their guesses were not right. And they learned that Venus is very hot.

【推荐2】Many people know that rubbish is a big problem on the planet Earth. What many people don’t know is that junk（垃圾）has become a problem in outer space too.

According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes （望远镜）. There are also millions of smaller pieces of junk that we can’t see.

Objects, like bits of old space rockets（火箭）or satellites（卫星）, move around the planet at very high speed so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage （损害）the space tool.

To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

To reduce additional （额外的）space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere （大气层）after that time. In the upper parts of the atmosphere, it will burn up.

Many scientists also suggest different ways to clean up space junk. In England, scientists are testing a special net that can be sent into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely dealt with.

“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,” says Marco Castronuovo, an Italian space researcher.

【推荐1】If people around you have had a fever recently, it may not be COVID-19. According to China Daily, many places in China have entered into the peak (高峰) period for seasonal (季节性的) flu. Influenza A (甲流) is sweeping across the country. To protect ourselves, it is useful to know about the following:

☆Symptoms (症状) of influenza A:

Cough, fever above 38°C, headache, sore throat

☆How to recover?

Most people don’t need to take medicine. The symptoms can go away after 3 to 7 days. But if the fever doesn’t go down after three days, go to see a doctor.

☆How is the virus spread (传播)?

Through coughs or sneezes (喷嚏). The viruses go into the air. If someone nearby breathes them in, they could get sick.

☆How to prevent it?

If you catch the flu, go back to school 48 hours after the symptoms go away.

Take vaccines (疫苗)

Wash hands often

Open windows often

【推荐2】If you look at the top of your phone, you’ll usually see a little symbol that says 3G or 4G. The “G” stands for the “generation” of your mobile network. But these symbols will become things of the past after 5G fully arrives.

On March 30th, 2019, Shanghai vice-mayor Wu Qing made the first 5G video call on a Huawei Mate X smartphone, CGTN reported. Shanghai has also become the first city in China to start testing 5G networks.

Now, 4G takes about 100 to 200 milliseconds to send and receive data. But 5G will get it down to 1 millisecond or less. This big change will not only make our mobile Internet faster. It can be used in many other ways as well.

For example, 5G will help to make self-driving cars safer. Today’s self-driving test cars have one problem—lag. When the car “sees” an obstacle (障碍物), it sends this information to a data center and receives instructions. However, it takes time to send and receive this information. With this kind of lag, the cars might crash because they don’t receive instructions in time. With 5G, this lag will be greatly lowered, making the cars safer, according to CNN.

5G could also be used to power the Internet of Things (IOT). This refers to a large online network that connects all things and people. Fast Internet speeds will be the key to developing this technology. For example, with IOT under 5G, your fridge could automatically (自动地) place an order online for eggs when it finds that there are no eggs left inside.

All in all, 5G will shape every type of technology that it touches. And you won’t have to wait too long for that to happen.

【推荐3】Now more and more people like to have a camping trip. They go out for a picnic. But how to prepare a picnic, the following suggestions may be helpful.

Pack your foods Before you set off, check if your food box is closed tight (紧紧地). If it’s a hot summer day, a cool box will be used for keeping your picnic foods. Don’t forget to pack cups or bottles for drinks. Having a picnic is one of the great joys in summer. Before you start looking for a shady (阴凉的) place to eat your sandwiches, there are some things you should think about.

Food safety You should keep things like meat pies, fish and dairy dishes (乳品菜肴) in cold boxes. You’d better keep your foods on ice for as long as possible before you eat them. Finally, carry some hand sanitizers (洗手液). Make sure that everyone’s hands are clean before they touch the foods.

Delicious snacks After you have prepared the main dishes, it’s time to pack some snacks. Chips, chocolate bars and cookies are nice picnic snacks. They are very delicious, of course. But be careful not to eat too many of them.