托福听力tpo9 Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.After the formation of the Hawaiian Islands, much time passed before conditions were suitable for plant life. 答案解析【小站备考】

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14.Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.After the formation of the Hawaiian Islands, much time passed before conditions were suitable for plant life.

Algae are classified as symbiotic because they produce energy through the process of photosynthesis.

The first successful plants on Hawaii were probably lichens, which consist of algae and fungi living in a symbiotic relationship.

Lichens helped create favorable conditions for the growth of spore-producing plants such as ferns and mosses.

Seed-bearing plants evolved much later than spore-producing plants, but both types of plants had evolved well before the formation of the Hawaiian Islands.

Unlike spores, seeds must move to new habitats in order to have a strong chance of survival and growth.

Seed-bearing plants arrived and spread quickly in Hawaii, thanks to characteristics that increased their seeds’ ability to survive and to move to different areas.

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正确答案：BCF

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BCF Algae选项的因果关系原文没说，即使说了也是个细节，不选。The first选项对应第二段从第三句一直到最后的部分，正确。Lichens选项对应原文第三段前两句，正确。Seed-bearing plants evolved选项MS对应原文第四段首句，但这段的首句并不是这段的中心，所以这个选项是个细节，不选。Unlike选项原文没说，不选。Seed-bearing plants arrived选项对应原文第四段最后一句和第五段第一句，正确。

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