When travelling overseas, do you buy water in plastic bottles or take your chances with tap water? Imagine you are wandering about on a Thai island or     1     (admire) the ruins of Angkor. It’s hot so you grab a bottle of water from a local vendor. It’s the safe thing to do, right? The bottle is sealed, and the label says “pure water”. But maybe what’s inside is not so     2     (nature). Would you still drink it if you     3     (know) that more than 90 percent of all bottled water sold around the world contains microplastics?

That’s the conclusion of a recently     4     (release) study, which analyzed 259 bottles from 11 brands sold in nine countries, revealing an average of 325 plastic particles per liter of water. These microplastics included a substance commonly known as PET and     5     (wide) used in the manufacture of clothing and food and liquid     6     (contain). The study was conducted at the State University of New York     7     behalf of Orb Media, a journalism organization. About a million bottles are bought every minute, not only by thirsty tourists but also by many of the 2.1 billion worldwide     8     live with unsafe drinking water.

Confronted with this evidence, several bottled-water manufacturers including Nestle and Coca-Cola undertook     9     (they) own studies using the same methodology. These studies showed that their water did contain microplastics,     10     far less than the Orb study suggested. Regardless, the World Health Organization has launched a review into the potential health risks of drinking water from plastic bottles.

A recent research shows that 86% of the world’s rivers have been damaged by human activities. The research     1     (conduct) by experts from a university in Toulouse, France,     2     examined data on over 2,500 rivers around the world.     3     (look) into changes in biodiversity (多样性) over the past 200 years, the scientists discovered that biodiversity in over half of the rivers has been seriously damaged by humans. The researchers said there were many reasons     4     this damage. A big reason is the     5     (introduce) of new species of fish into rivers. Other reasons include pollution, dams, overfishing, farming     6     climate change.

Unsurprisingly, the worst-hit rivers are in western Europe and North America. This is because these regions have large and rich     7     (city) crowded with people. The lead researcher Brosse said: “Rivers which have the most economic development around them, like the Mississippi River, are the most     8     (strong) affected.” The River Thames in London was one of the worst-affected rivers in the study. The least-affected rivers are in Africa and Australia. This is probably due to a     9     (slow) rate of industrialization in Africa and smaller population around rivers in Australia. Brosse added that rivers in many rich nations are unrecognizable compared with how they     10     (be) 200 years ago.

There are     1     (vary) causes of water pollution. Large amounts of industrial waste poison the water after they enter water bodies. Moreover, animal and human waste pollutes the water. Water pollution is also caused by     2     (poison) chemicals used in agriculture.

    3     (pollute) water bodies not only do harm to animals and plants; they also have a long-lasting effect     4     humans. For example, in many parts of the world, the poor quality of the local     5     (drink) water gives rise     6     public health problems.

    7     (prevent) further damage     8     water bodies, it is necessary to take some measures. First, we must draw public attention     9    the problem. Second, more strict laws should    10     (pass) to help reduce water pollution. Third, we can volunteer to take part in clean-up activities.

China will closely track     1     assess the impacts of Japan's "extremely selfish and     2    (responsible) " plan to discharge nuclear-contaminated water into the ocean, the National Nuclear Security Administration said.

Japan's plan prioritizes its own interests     3     the long-term well-being of humanity, the administration said in     4     media release on Thursday, the same day that Japan is set to start releasing     5     (treat) radioactive water into the Pacific Ocean     6     part of its plan to decommission the crippled Fukushima Daiichi Nuclear Power Plant.

Japanese Prime Minister Fumio Kishida     7     (give) the final go-ahead for the plan to gradually release more     8    1 million metric tons of radioactive water from the plant into the ocean at a Cabinet meeting on Tuesday.

"We urge the Japanese government to listen to the voice of the international community and     9     (effective) dispose of the nuclear-contaminated water in a     10     (science), safe and transparent manner under strict international supervision," the administration said.

Air pollution has largely gone under-reported by the media, yet despite     1     (it) silent nature, it’s a killer. According to the Royal Colleges of Physicians and Pediatrics and Child Health, air pollution leads to 40,000 early     2     (death) a year. The trouble is that it’s an indirect killer, which makes the issue hard to examine — meaning the actual figure could be much     3     (high).

Then how can we measure and end such a problem? The answer is     4     (surprising) simple. Diesel (柴油) is the largest contributor of nitrogen oxides (氮氧化合物) and around 40 million people in the UK live in areas     5     (pollute) by diesel. We need to stop the production of diesel vehicles as soon as possible, and replace older diesel models     6     eco-friendly alternatives, such as electric vehicles. Apart from ammonia (氨) farming, pollution is actually decreasing globally — except for cities     7     it’s on the rise. In London, nearly 10,000 people died due to the capital’s harmful air, so     8     (create) clean air zones where high-polluting vehicles     9     (ban) would decrease these harmful gases. By moving towards more greenery on rooftops, parks and city centers, big cities could easily remove     10     problem. The answers are there; we just have to start.

Given the fact that chemical pesticides and artificial fertilisers can fight crop disease and increase production, they     1    (be) in widespread use since the 1950s. However, with time going by, they have been proved     2    (harm) to the environment and human health if     3    (use) for a long time.