Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers.

　　The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon.

　　The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet.

　　1. In the past, deep canyons were believed to have formed _______.

　　A. as a result of a sudden break of volcanoes

　　B. due to river flows over millions of years

　　C. owing to the burst of artificial dams

　　D. thanks to our ancestors’ creative work

　　2. According to the passage, which of the following statements is TURE?

　　A. Several volcanoes broke out on Mars directly creating grand canyons.

　　B. Several great lakes existed on the upper parts of the Colorado River.

　　C. People built high dams on the upper parts of the Colorado River.

　　D. The Colorado River crossed the Grand Canyon to form down-cutting.

　　3. From the last three paragraphs we learn that _______.

　　A. there are great lakes on Mars

【2016届湖南长沙市高考英语二轮阅读理解训练（6）（含答案）】相关文章：

★ 2017届高考英语二轮复习课时训练：21（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (62)

★ 2017届高考英语二轮复习课时训练：13（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习阅读理解解题技法示范课件：2

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：创新押题（含解析）

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（6）附答案

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（3）及答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (2)

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (15)

★ 辽宁省辽阳市2014高考英语单项选择一轮（暑假）训练（7）附答案