【推荐3】How to prepare for an exam is a big question that you always ask yourself. Here are some tips that may help you.

Never fear or hate exam and be confident.

Some students study well but still may be much afraid of exams and due to this reason they get upset and won’t be able to get marks.    1    You have to be confident and it is of great help for you to gain success.

Prepare a good timetable.

Prepare a timetable before starting the study.    2    Difficult subjects can be given more time and easier ones less, but most importantly you should spare some time for rest.

Select a proper atmosphere for studying.

Studying atmosphere plays a very important role. Can anyone study well while others around are watching TV? So pick a place where you feel comfortable.     3     Make sure that while you are studying a subject you are focusing on it only. So keep the books of other subjects away from your eyesight so that you won’t be upset about all the things you have to learn.

Make notes while studying.

This is a very important point. While studying, make small notes. The note should be short and clear to make the review easier.    4    Yet don’t try to cover everything in it.

    5    

On the night before exam you have to sleep well, at least 6 hours and not more than 8 hours. Remember this will have a great effect on your exam. And have your food as in your daily diet.

【推荐2】Plastic waste is choking our planet. People are trying to help fix it by recycling, but their efforts aren’t going far enough. Even when plastic producers are held responsible and attempt to solve the problem, it doesn’t always go smoothly. Such has been the case for the company Torus Pak, which produces novel packaging for frozen meals on a large scale.

Like many other black plastic products, the Torus Pak packages used a carbon-based pigment (颜料). This pigment troubles the sorting technology which is used by many recycling facilities, so black plastic usually ends up being thrown away because the machines can’t identify it. Now the company is midway through the complex process of phasing out that pigment and switching that pigment to one that doesn’t use carbon.

But that doesn’t mean the problem is solved, for the recycling rate at the waste facility itself is not encouraging. Your discarded plastic may end up in a landfill even if you send it to be recycled. Worldwide, only about nine percent of all the plastic waste has been recycled, which amounts to less than 600 million tons out of over 6 billion. While one might assume the proportion of plastic being recycled is on the increase due to improved tech and increased public awareness of environmental protection, it’s actually become even lower in many places in recent years.

“The world wasn’t always flooded with single-use plastic products,” said Lisa Ramsden, senior plastic campaigner for Greenpeace USA. “We know how to live without them. We’ve just got used to a convenience culture that relies so heavily on them.”

The solution is obvious. To get out of this habit, we should stop using so much plastic, starting with many of the items we use just once for a few minutes. Companies need to shift toward using more refillable and reusable containers, and packaging made from materials that are less harmful to the environment. Governments must mandate (强制执行) such changes a goal we’re now finally inching closer to every day.

【推荐3】The newly-elected president of Brazil, Jair Bolsonaro says that his country should withdraw (退出) from the 2015 Paris Agreement, and that Brazil’s rainforest protections are standing in the way of economic success. During the election campaign, he promised to ease protections for areas of the Brazilian Amazon set aside for native people and wildlife. Are Brazil’s rainforests in danger?

The Amazon, the world’s largest rainforest, is called “the lungs of the planet.” Each tree takes in and stores carbon dioxide from the air around it. Billions of trees pull up water through their roots and release water vapor into the air, forming tiny drops of water. The Amazon creates 30 to 50 percent of its own rainfall. Carlos Nobre, a climate scientist, says that it is almost impossible to say Just how important the rainforest is to the planet’s living systems.

Some of Bolsonaro’s support comes from business and farming groups. One supporter, Luiz Carlos, noted that farmers “are not invaders, they are producers.” He blamed the past government for supporting rainforest protections at the cost of farmers. “Brazil,” he said, “will be the biggest farming nation on Earth during Bolsonaro’s years.”

Paulo Artaxo, a professor of environmental physics at the University of Sao Paulo, says that if Bolsonaro keeps his campaign promises, then “deforestation of the Amazon will probably increase quickly — and the effects will be felt everywhere on the planet.”

Other scientists warn that if the Amazon and other tropical rainforests lose too many trees, this could affect rainfall in other areas. Without enough trees to support the rainfall, the longer and bigger dry season could turn more than half of the rainforest into a tropical grassland.