题目

根据短文内容，完成下列各题。 Good afternoon. My name is Tom Green. Iwork (A) __________the World Wide Fund for nature. It's also known as WWF. Wework in (B) around 100 countries and have close to five million members.We want to help make the world a better place for people and animals to livein. Did you know that there are (C) 数千的endangered animals (D) aroundthe world? These animals may die out soon if we don't take good care ofthem. South China tigers, giant pandas and Asian elephants are all endangeredanimals. They're endangered (E) _________people cut down forests and po如图是A、B两种固体物质的溶解度曲线。(1) P点含义______________。(2)A中含有少量B，提纯A的方法______________。(3) t1°C时，25gA溶解在100g水中所形成溶液的溶质质量分数(填“>”、“=”或“<”)____________25%(4) t3°C时，将等质量的A、B两种物质的饱和溶液分别降温至t1°C，所得溶液中溶剂质量的大小关系是______________。