Giant pandas are seen as living proof     1     conservation works, the numbers of which in the wild are recovering after years of decline.

The distinctive black and white bear     2     （regard ）as an “umbrella species”. That means protecting the mountain forests     3     they live has been good for many other animals, including birds and small animals that mainly feed on meat.

Yet, according to a new study published in the journal Nature Ecology Evolution, it’s a     4     （complete）different story for larger predators（食肉动物） such as leopards and wolves. Asian wild dogs have disappeared from 95% of areas set up     5     （protect） pandas in the 1960s. Leopards, wolves and snow leopards have also been found much     6     （few） than before. Scientists in China say these four predators are being driven     7     near extinction by illegal hunting and destruction of     8     （they） habitat.

Conservation efforts have often been based on protecting specific species such as the panda. But experts argue for a new approach that     9     （aim） to protect whole ecosystems, rather than focusing on a single species. Thus, the       10     （disappear） of larger predators will hopefully slow down.

The earliest elephant relatives     1    (originate) in Africa about 60 million years ago and were driven away to every continent on earth, except Antarctica and Australia. There are about 165     2    (know) elephant species from the fossil record. However, scientists estimate that there would have been many — more species that we haven’t found yet in this branch of     3     evolutionary tree of life.     4     Earth’s more recent history, between 50,000 and 40,000 years ago, there were 16 species of elephants with their relatives     5    (live) at the same time around the world, including at least seven in the United States. Today, there are only three species of elephants that remain: the African savannah elephant (萨凡纳象), the African forest elephant, and the Asian elephant.     6     (population) of all three species are declining, with Asian elephants    7     (current) at a much higher risk of extinction.

Today’s elephants are part of the order Proboscidea (长鼻目) that consists of modern elephants and their extinct relatives. This kind of, the animals     8    (have)a proboscis, or trunk, which they use to eat and drink.     9    today there are only three species of elephants surviving, their evolutionary history is much     10     (diverse).

Jane Goodall has studied the chimps for many years and helped people understand how much they behave like humans.     1    her childhood she had wanted to work with animals in their own environment .However，this was not easy. When she first arrived in Gombe in 1960，it was     2    (usual) for a woman     3    (live) in the forest. Only after her mother came to help her for     4    first few months was she allowed to begin her project. She spent many years    5    (observe) and recording their daily activities，and watching them wake up was her first activity of every day. She also discovered     6    chimps communicate with each other. She has argued that wild animals should     7    (leave) around the wild and not used for entertainment or advertisements.

She has helped to set up special places     8    they can live safely. She has achieved everything she wanted to do，and she     9    (respect) by many people around the world. And now she inspires those who want to cheer the     10    (achieve) of women.

To change bad habits is never easy, even with many     1     (attempt). There is a famous saying     2     (base) on the philosophy of Aristotle: “We are what we     3     (repeat) do.” In many ways, our lifestyle is the sum of choices we have made. We make a choice to do something, and then we repeat it over and over again. Soon that choice becomes automatic and forms a habit that is much     4     (hard) to change. The good news     5     (be) that we can change, if we understand how habits work.

Then what is causing the increase in the global average surface temperature? Climate scientists often mention a key climate process called the “greenhouse effect”,     6     has two common meanings: the “natural” greenhouse effect and the “man-made” greenhouse effect. The “natural” greenhouse effect refers to the fact     7     heat from the sun enters the atmosphere and warms Earth’s surface as short-wave radiation. The heat is released back into space at longer wave lengths. Greenhouse gases in the atmosphere, such as methane and carbon dioxide, trap some of the heat,     8     (keep) Earth’s climate warm and habitable. Without this process, Earth could not sustain life. However, the “man-made” greenhouse effect has now become a big problem. When people produce huge amounts of extra greenhouse gases by burning fossil fuels, more heat energy     9     (trap) in the atmosphere and causes Earth’s surface temperature     10     (rise) quickly.

China's online food delivery platform Ele.me has carried out a new service of picking up garbage from its users in Shanghai     1     July 2019.

The service comes after     2     recently-released regulation on waste management in Shanghai. Individuals     3     throw away their garbage without sorting it can be fined up to 200 yuan, while companies and     4     (organize) can face fines up to 5,000 yuan.

The trash taking service requires residents to sort     5     (they) own garbage before it     6     (pick) up by workers from Ele.me, who will ensure the waste is disposed of in the correct garbage bins.

It's obvious that this service is     7     (convenience) to the old, especially to the disabled customers.

However, many netizens on Sina Weibo don't think Ele.me is providing a wonderful service, saying it just wants     8     (make) money. They think 12 yuan for an order is too much.     9    , many more people doubt if these collectors will wash their hands after dealing     10     the trash.

Each year, 25 million tons of seaweed     1     (harvest), most of which is used for human consumption. But what about using it to power our vehicles? Danish scientists recently announced they had used a seaweed fuel to power an automobile,     2     (achieve) speeds of 80 kph.

One of the     3     (large) sources of clean renewable energy used today is biofuels.     4     (produce) from garbage or the agricultural by-products from growing crops like sugar and corn, they contribute to energy     5     (secure) while also reducing carbon emissions. Within Europe's transportation sector     6     vast quantity of renewable energy-powered solutions use these land-based sources of biofuels. However, they require land, fertilizer (肥料), and irrigation resources     7    (make) these biofuels, so Europe is looking largely towards ocean-based sources of biofuels — namely algae and seaweed,     8     need nothing more than saltwater and sun to grow incredibly fast.

Van Hal, the scientific coordinator for EU-funded MacroFuels, says learning to manage a 10-acre seaweed farm is similar to managing a 1,000-acre farm. To turn seaweed fuel     9     a reality, though, requires a supply on a “huge scale”. He aims to create an entire industry around seaweed biofuels that includes farming, producing and testing —    10     (specific) for heavy machinery like trucks and ships.