Polar bears in the Arctic Circle rely on sea ice to help them hunt for seals. But due to warming temperature, that sea ice is melting sooner in the spring and freezing later in the fall, forcing the bears    1     (go) hungry for longer .

Nowadays, researchers have discovered a unique group of polar bears who’ve found a new way to survive in the     2    (absent) of sea ice: By hunting from the ice that falls off glaciers. The findings    3    (publish) in Science offer hope for a species that may be trending towards extinction by the end of the decade. The researchers urged caution against applying their findings     4     other populations of polar bears, who are still     5    (unavoidable) threatened by the planet’s warming.

The bears     6     (live) in southeast Greenland go through a long period without sea ice around250 days. But they’ve been able to continue hunting during that period by using     7     falls off from glaciers into the water.

Although the southeast Greenland bears     8    (adapt) to their surroundings over the past decades, rising temperatures may eventually cause their glacial ice to get smaller or even disappear. As Steve Armstrup,     9     scientist with Polar Bears International , says, “While the southeast Greenland bears are able to hunt with glacial ice today, that will be almost impossible in the future     10     we control the rise of global greenhouse gases.”

Many animals use camouflage (保护色) to make them harder     1     (see). Hunters such as leopards do this so that the animals they want to eat don’t see them and run away. Prey animals such as deer use camouflage to avoid     2     (eat).

Will Allen at the University of Bristol is enthusiastic about why animals such as cats have different patterns. For example, why are a leopard’s spots different from     3     of a cheetah (猎豹)? In     4     attempt to find out the reasons, he decided to use a mathematical technique called “reaction-diffusion”. He also talked to scientists from many different fields such as     5     (psychological), engineering and computer science. In this way, he could compare camouflage patterns with the animals’ behaviors and habitats much more     6     (accurate).

Will has discovered that the patterns     7     (connect) with the environment. Cats that live in forests with many trees have more complicated patterns and cats     8     (spend) more time in trees have more irregular patterns. Will concludes that cats’ camouflage depends on     9     they live and how they hunt. Evolution has created the most suitable pattern for each particular hunter. Will’s studies mean we can predict a big cat’s habitat and lifestyle     10     looking at the patterns of its fur.

Using social media too much and posting many selfies （自拍照)have caused a rise in narcissism，according    1     a new study.Narcissism is when someone becomes very self-centred and believes they are quite attractive.They want attention and likes from other people and think they are    2     ( good) than everyone else.Researchers at universities in Swansea and Milan studied how 74 people aged 18 to 34 used social media and    3     (look) at how their personality(性格〉changed. The researchers found that those    4     used social media    5     ( heavy)through posting selfies showed an average 25% increase in narcissism over the four months of the study.

Professor Phil Reed，from the Department of Psychology at Swansea University，said:“There have been    6     (suggestion) of connections between narcissism and the use of selfies on social media but    7     was not known if using social media was connected with narcissism until this study.The results of this study suggest that posting selfies can increase narcissism. Professor Reed said that about 20 per cent of people may be at risk of    8     (develop)narcissism. This is because they want     9     (get) attention from other people after they post a selfie and show others how    10     (they) life is better or how they are more attractive.

Food wasting is still on the increase worldwide currently. In the United States alone, grocery stores throw away     1     (billion) of pounds of food every year. Sometimes it’s because the food is nearing its sell-by date, even though that doesn’t mean it can’t be eaten. Other times, it’s     2     (simple) because the food is strange-looking, even though the food is in good condition. Whatever the reason is, there is more and more food waste in landfills, contributing greatly     3     the production of greenhouse gases.

In early 2016 in France, a law was passed to prevent food from     4     (throw) away by large grocery stores, as long as the food is still safe to eat. French stores can choose to donate it to charities such as food banks. The law makes     5     much easier for stores to donate their food since grocery stores     6     (large) than 4,300 square feet must sign contracts with food banks. Grocery stores     7     don’t follow the law must pay a heavy fine up to almost 4,000 dollars. This is a major step in helping reduce food waste and dealing with     8     (hungry) as well.

The law doesn’t stop there. In addition, it requires that French schools teach children about food waste and what they can do to help fix the problems     9     (bring) about by food waste.

France was the first country in the world to pass a law like this, and since 2016, it     10     (become) a world leader in reducing food waste.