⑧考拉的年纪有多大？ In ideal conditions in the wild, male koalas live to about the age of 10; females may live a few years longer .野外条件理想的情况下，成年雄性考拉能活到十岁，雌性活的还要久一点。
⑨世界上有多少只考拉？ There were once millions of koalas, but the popularity of their sturdy fur resulted in massive hunting of them in the 1920s and '30s, leading to a major decline in their numbers. 地球上曾经有成百万只考拉，然而坚实的皮毛也成为20世纪二三十年代它们遭到疯狂捕杀的原因，结果造成数目急剧下降。
