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单选题
Which of the following best expresses the main idea of Paragraph 2?
A
Because of their characteristics as double organisms, it is difficult to classify lichens.
B
Over 15,000 varieties of lichens have been identified.
C
Double organisms should always be classified as separate species.
D
Taxonomists always find it difficult to classify new species of plants.
参考答案
参考解析
解析：
段落大意。第二段第一句指出“地衣是两种植物--真菌和藻类的共同体”，接着本段描述了两者之间互利共生的关系。该段最后一句提到“They can be placed in known classes of fungi but are unlike any species that lives independently.”，可知真菌无法独立生存，因此对其进行分类会很困难。故选项A符合文意。
段落大意。第二段第一句指出“地衣是两种植物--真菌和藻类的共同体”，接着本段描述了两者之间互利共生的关系。该段最后一句提到“They can be placed in known classes of fungi but are unlike any species that lives independently.”，可知真菌无法独立生存，因此对其进行分类会很困难。故选项A符合文意。
更多 “单选题Which of the following best expresses the main idea of Paragraph 2?A Because of their characteristics as double organisms, it is difficult to classify lichens.B Over 15,000 varieties of lichens have been identified.C Double organisms should always be classified as separate species.D Taxonomists always find it difficult to classify new species of plants.” 相关考题
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