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

　　B. there are active volcanoes on Mars

　　C. there might be cities on Mars

　　D. there might be life on Mars

　　4. The passage can be titled as _______.

　　A. Lakes on Earth and Mars

　　B. The Cause of Lake Formation

　　C. The Force of Dam Breaking

　　D. Canyons—Results of Flood Cutting

　　参考答案1—4、B B D D

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