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托福阅读句子简化题：The surface of Mars

2015-08-20 18:27:44来源：网络

　　【托福阅读题型：The surface of Mars句子简化题】托福阅读中句子简化题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子简化题

　　托福阅读句子简化题：The surface of　　Mars

　　【Paragraph 3】The great height of Martian volcanoes is a direct consequence of the planet’s low surface gravity.As lava flows and spreads to form a shield volcano, the volcano’s eventual height depends on the new mountain’s ability　to support its own weight. The lower the gravity, the lesser the weight and the greater the height of the mountain. It is no　　accident that Maxwell Mons on Venus and the Hawaiian shield volcanoes on Earth rise to about the same height (about　10 kilometers) above their respective bases-Earth and Venus have similar surface gravity. Mars’s surface gravity is only　40 percent that of Earth, so volcanoes rise roughly 2.5 times as high. Are the Martian shield volcanoes still active?　Scientists have no direct evidence for recent or ongoing eruptions, but if these volcanoes were active as recently as 100　million years ago (an estimate of the time of last eruption based on the extent of impact cratering on their slopes), some　　of them may still be at least intermittently active. Millions of years, though, may pass between eruptions.(The surface of　　Mars)

　　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.

　　○ Although direct evidence of recent eruptions is lacking, scientists believe that these volcanoes were active as　recently as 100 million years ago.

　　○ Scientists estimate that volcanoes active more recently than 100 years ago will still have extensive impactratering on their slopes.

　　○ If, as some evidence suggests, these volcanoes erupted as recently as 100 million years ago, they may continue　　to be intermittently active.

　　○ Although these volcanoes were active as recently as 100 million years ago, there is no direct evidence of recent or　ongoing eruptions.

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 句子简化题

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