九年级上册，unit1，topic2，Section B1 population 人口，人数，常用large/ small来表示人口多或少。作主语时，谓语动词用单数。the population of+数量 是表示人口数量的常用短语Eg. China has a population of nearly 100.拓展：询问人口数量时，应用whats the population of ?have a population of 有人口eg. China has a population of 1.3 billion.2 increase v. 使增加，使增大、增多；名词，a big increase 巨大的增长拓展：increase by.增加了，后面跟倍数或百分数Eg. The price of oil increased by 29%.油价涨了29%。increase to增加到后面跟具体数字；increase from to 从增加到；on the increase 正在增加，不断增长eg. The number of the students in our school has increased to 2.510.The population has increased from 1.2 million to 1.8 million.3 reach 达到，增加到（某一速度、数量等）Eg. Daytime temperatures can reach 40.Reach还有“实现，到达，够得着”的意思4 take measures to do sth 采取措施做某事Eg. The government takes many measures to improve the environment.