What does the author imply about lichens in Paragraph 1?-考呗网

单选题What does the author imply about lichens in Paragraph 1?

[分析]推断题型
从第一段第一句可推出在多种气候、自然条件、环境下，Lichens均可生长，因此可知D(Lichens可适应多种环境)为答案。

1Why does the author call lichens pioneers?

2The word“barren”underlined in Paragraph I most probably means__________．

3Which of the following is an example of symbiosis as it is described in Paragraph 2?