part 2 teaching resources 第二部分 教学资源 section 2 notes to difficult sentences from unit 3 australia australia is home to more than 170 different kinds of snake and 115 of these are poisonous．澳洲是超过 170只不同类型的蛇的家园，其中115种是毒蛇。句中home意思是native habitat: the place where an animal is most common or indigenous。例如
