One type of recycling, called downcycling, involves repurposing a material into a new product of lesser quality. It can include varying grades of plastic, paper products, and other materials.

Downeycling 【小题1】 (know) as downstream recycling. It is most common in terms of 【小题2】 (industry) materials. These products lose their value as they are recycled, 【小题3】 limits their capacity for new use. Their recycled form is typically both weaker and cheaper 【小题4】 their original one. White writing paper, for example, is often downcycled into cardboard; once downcycled to this new form, it can no longer be used as white paper again.

【小题5】 (give) products a new life is considered a good way to reuse materials and avoid waste. Once downcycled to their full capacity however, these materials are eventually so degraded that they cannot be reused further. Since downcycled products are considered of lower quality than their original form, they cannot be used in remaking their original product.

Products are provided with codes 【小题6】 (determine) their grades and whether or not they may be recycled. Plastic, glass, and aluminium products 【小题7】 (code) with the number one may be remade into something 【小题8】 equal or greater value. This type of recycling is known as upcycling, and represents the forward compatibility of recycled components.

Items available for downcycling often require additional chemicals, energy, 【小题9】 other treatments in order to transform them into something usable. Durable plastic products in particular require much additional treatment. Trash bins, tables, and chairs are also considered materials with 【小题10】 high energy cost to recycle.

American Gaylord Nelson launched the first Earth Day in 1970, 【小题1】aim was to increase people's understanding of our planet and its environment.

The creation of Earth Day is widely considered the beginning of the modern environmental【小题2】(move). Something unplanned this year is changing the planet.

Many people continue to stay at home【小题3】(stop) the spread of the new coronavirus. As a result, people are making less pollution, and the air has become cleaner.

In India smog stops【小题4】(cover) New Delhi, one of the world's most polluted cities. Air pollution levels have dropped 49 percent【小题5】(compare) with a year ago. Cleaner air has been most noticeable. For example, 【小题6】April 3, people living in Jalandhar, a city in the north, 【小题7】(wake) up to a sight: snow-covered Himalayan mountains more than 160 kilometers away.

People also report seeing wild animals in unusual places. Coyotes have been observed walking in downtown Chicago. Goats entered a town in Wales and showed no interest in leaving. These were【小题8】(near) impossible in the past.

Stuart Pimm,【小题9】scientist at Duke University, says the stay-at-home orders are “giving us this extraordinary insight into how much damage we humans are doing to our beautiful planet. Besides, the situation is also providing a【小题10】(value) chance to see how much better it can be.”

Yesterday we went camping at the foot of the mountain. 【小题1】 impressed us most was the beauty of the high mountain. There were a great many tourists visiting the mountain. There was no doubt 【小题2】 they were attracted by the beauty of the mountain as well. During the camp, we found some waste thrown away by the tourists. 【小题3】 we were concerned about was 【小题4】 the tourist spot could be well reserved. We came up with an idea 【小题5】 we called for the tourists to pay attention to protecting the environment and 【小题6】 they should put away the waste. That’s 【小题7】 we did to protect the environment. Some of the tourists agreed 【小题8】 it was important to protect the environment. 【小题9】 we can live in harmony with nature depends on 【小题10】 we take action to reduce the pollution.