2. 外语
  3. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the

Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the

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问题 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 sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.
Write your answer choices in the spaces where they belong. You can either write the letter of your answer choice or you can copy the sentence.
Over time, a variety of views have been formed on the structure of ecological communities.
                        Answer Choices
[A]Clements held that ecological communities were like organisms that compete with each other for dominance in a particular climatic region.
[B]Clements saw the community as a collection of thoroughly interdependent species progressing toward a single climax community.
[C]Gleason held that within a single climatic region, differing local factors would cause ecological communities to develop in different ways.
[D]Gleason believed that sharp divisions would exist between species in different habitats.
[E]Today’s ecologists recognize that ecological communities must be precisely and permanently balanced.
[F]The current thinking is that communities are individualistic and largely accidental collections of species with similar needs and tolerances.
选项
答案B, C, F
解析
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