1．(2020·新高考全国卷Ⅰ)And contrary to existing research that says you should avoid eating with heavier people who order large portions (份)，it's the beanpoles with big appetites you really need to avoid.现有的
2．(2019·北京卷)A lot of business is still done over the phone，and much of it is based on trust and existing relationships.现存的
3．(2019·江苏卷)So scientists are trying their best to save the species from going out of existence.存在
