美国留学趋势分析
美国本科国际升学是朗阁教育针对中国高中生量身打造的高端体验培训学习服务体系，提供优质的语言培训和专业的留学申请服务于一体。
在语言培训方面，朗阁有深耕且专业的考试中心。立足于基本词汇和专业语法，从听说读写四个方面综合提升学生的英语能力和应试技巧，从而帮助学员顺利达到赴美读本科所需要的托福成绩和SAT/ACT成绩。
在留学申请方面，朗阁有专门负责美国留学的项目中心，为学员提供科学、专业的咨询服务。以精确的留学信息和留学咨询为本，提供院校选择、背景提升、文书指导、留学申请和签证辅导于一体的全程化服务。终，帮学员实现无忧留美
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The Evolutionary Origin of Plants
1、the word "presumably" in the passage is closest in meaning to
Originally
supposedly
Obviously
Usually
2、According to paragraph 1, all of the following are true of ancestral plants EXCEPT f
They had cellulose-based cell walls.
They were closely related to green algae
They were able to store nutrients
They had a sophisticated multicellular structure.
3、The phrase "subjected to" in the passage is closest in
restricted by
distant from
exposed to
combined with
4、What can be inferred from paragraph 3 about ancient green algae?
They lived in a generally wet environment that was sometimes dry
They adapted better to changes in water temperature than did to other changes in the environment.
They inhabited areas that were close to the ocean.
They had lived primarily on land
5、The word "desolate in the passage is closest In meaning to
dusty
hardened
deserted
dried out
6、Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.
Terrestrial plants had the advantages of not having rivals and having easy access to photosynthetic material
The abundance of photosynthetic material made life on land easier for pioneering plants
Once plants had eliminated their competitors and their predators, their evolutionary process proceeded smoothly.
Plant evolution eliminated competitors and made the process of photosynthesis more efficient.
7、According to paragraph 4, which of the following is true about the terrestrial world at the time it was colonized by plants?
it was exposed to high levels of solar radiation
it contained a limited supply of carbon dioxide
it had developed 400million years earlier
it lacked the presence of any organisms
8、the word "posed" in the passage is closest in meaning to
shared
presented
strengthened
concealed
9、According to paragraph 5, all of the following are problems that early terrestrial plants had to overcomeExcept
a tendency to become dry
the inability to limit surface sunlight
the absence of a structure to support the body of the plant
the inability to transport water and minerals through the plant minerals
10、What purpose does paragraph 5 serve in the larger discussion of the origins of terrestrial plants?
To emphasize how long it took for ancestral plants to adjust to life on land
To disprove the argument that land plants adapted easily to their new terrestrial environment
To explain how plant colonization changed the physical environment of the terrestrial world
To describe how ancestral plants solved the problems they confirmed in colonizing
11、According to Paragraph 6, The adaptation made by terrestrial plants had which of the following effect?
Plants developed reproductive strategies usable in both land and water environment
The plant diversity achieved in water environments diminished on land
Seed plants became the dominant species among plants
A greater range of plants was able to develop
12、Which of the following best describes the authors presentation of the information about land plants?
The author provided and overview of the evolutionary relationships between specific species of algae and land plants
The author discusses the transformation plants underwent in the process of changing from an aquatic to a terrestrial environment
The author establishes a pattern of similarity between major land and water pant groups
The author resents evidence to support the hypothesis that plants first fully evolved in water before finding their way to land
13、Look at the four squares [ ] that indicate where the following sentence could be added to the passage.
Scientists believe that chemical changes and a thicker exterior, among other things, may have helped ancient algae overcome the conditions in their environment.
Where would the sentence best fit?
D
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 sentences do not belong in the summary because they express ideas that not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
In moving from water to land, ancestral plants overcame many obstacles in order to survive.
A． Neither brown nor red algae are likely to be ancestors of plants because of their difference in pigmentation
B．The instability of freshwater habitats caused marine algae to develop adaptations to their harsh environment.
C. The colonization of land by plants was a major revolution in the history of Earth.
D. Terrestrial plants adjusted to life on land by undergoing structural changes that enabled them to support themselves, resist drying and exchange gases.
E. To colonize new terrestrial habitats, plants needed to create a way of reproducing without water.
F. Once plants had overcome the challenges posed by terrestrial life, they prospered by becoming less diverse.
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