A. thinks highly of the man

　　B. often gives the man some help

　　C. knows the man very well

　　D. considers the man strange

　　22. What does the underlined word “distressed” probably mean?

　　A. exited

　　B. generous

　　C. bored

　　D. anxious

　　23. What did the writer learn from the man?

　　A.to show concern for other people.

　　B.to lead a happy life like the man.

　　C.to share what he has with us.

　　D.to believe that people are born kind.

　　A篇

　　21.D 22.D 23.A

　　B

　　How the Grand Canyon (大峡谷) was created remains one of the geology’s greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.

　　Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤坝) bursts.

　　Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔岩) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.

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