2019年12月英语四级（第1套 · 含听力）选词填空

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 __26__ 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 __27__, and the label says "pure water". But maybe what's inside is not so __28__. Would you still be drinking it if you knew that more than 90 percent of all bottled water sold around the world __29__ microplastics?
That's the conclusion of a recently __30__ study, which analysed 259 bottles from 11 brands sold in nine countries, __31__ an average of 325 plastic particles per litre of water. These microplastics included a __32__ commonly known as PET and widely used in the manufacture of clothing and food and __33__ containers. The study was conducted at the State University of New York on behalf of Orb Media, a journalism organisation About a million bottles are bought every minute, not only by thirsty tourists but also by many of the 2.1 billion worldwide who live with unsafe drinking water.
Confronted with this __34__, several bottled-water manufacturers including Nestle and Coca-Cola undertook their own studies using the same methodology. These studies showed that their water did contain microplastics, but far less than the Orb study suggested. Regardless, the World Health Organisation has launched a review into the __35__ health risks of drinking water from plastic bottles.