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

【2017届广西来宾市高考英语一轮复习阅读理解专项练习：39（含解析）】相关文章：

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

★ 2017届高考英语二轮复习书面表达限时测验：6（含解析）

★ 2017届高考英语二轮复习课时训练：23（含解析）

★ 四川省2016届高考英语一轮复习课时作业（37） Module 1 Basketball 外研版选修8

★ 【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：10

★ 四川省2016届高考英语一轮复习课时作业（30） Module 6 Animals in Danger 外研版必修5

★ 湖南省岳阳市2014高考英语一轮单项选择训练题（4）及答案

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（14）附答案

★ 2014届高考英语一轮复习课时作业(三十九)选修7Module 3《Literature》（外研版）

★ 2014届高考英语一轮复习课时作业(四十四)选修8Module 2《The Renaissance》（外研版）