汽油焊割机主要由防爆储油罐、耐油胶管、焊割炬三部分组成，机体轻便，易于携带和高空作业。（）
参考答案：对
_____ from other continents for millions of year, Australia has many plants and animals not found in any other country in the world.
A．Being separated
B．Having been separated
C．Having separated
D．To be separated
我会给下列多音字组词。
闷 mēn（ ）mèn（ ） 几 jǐ（ ）jī（ ） 散 sǎn（ ）sàn（ ）
