托福考满分阅读练习

Question 10 of 10
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. This question is worth 2 points.
Drag your answer choices to the spaces where they belong. To remove an answer choice, click on it.To review the passage, click VIEW TEXT.
Volcanoes and impact craters are major features of Martian geology.

Answer Choices

  • A. Plate motion on Mars, once considered to have played no role in shaping the planet’s surface, is now seen as being directly associated with the planet’s earliest volcanoes.

  • B. Mars has shield volcanoes, some of which are extremely tall because of the planet’s low surface gravity.

  • C. Although the erosive power of the Martian atmosphere ensures that Mars has fewer craters than the Moon does, impact craters are prominent on Mars’ s surface.

选项拖拽困难时，可以试试缩放屏幕，或者拖拽时使用鼠标滚轮调整屏幕哦

  • D. Scientists cannot yet reliably estimate the age of the Martian surface because there has been too much erosion of it.

  • E. Scientists have been surprised to discover that conditions just below the surface of Mars are very similar to conditions just below the surface of the Moon

  • F. Studies of crater ejecta have revealed the possibility of a layer of permafrost below the surface of Mars.

选项拖拽困难时，可以试试缩放屏幕，或者拖拽时使用鼠标滚轮调整屏幕哦

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