.

　　A. dog

　　B. horse

　　C. parent

　　D. child

　　57. Which of the following is true according to the text?

　　A. Molly can speak to people in kind words.

　　B. Kay Harris took Molly to a children’s hospital after the attack.

　　C. In the beginning, doctors had planned to end Molly’s life.

　　D. Molly sometimes leaves smiling marks on people’s faces.

　　58. What is unique about Molly?

　　A. Molly has a false leg with a horseshoe shaped like a smiling face.

　　B. Molly ran a race and won the first prize.

　　C. Molly often visits places such as schools and parks.

　　D. Molly has become a symbol of hope for people of all ages.

　　B

　　Mountaineers have noted that as they climb, for example, up to the 12,633­foot Humphreys Peak in Arizona, plant life changes greatly. In the Sonoran Desert, one climbs into a pine forest at 7,000 feet and a treeless tundra(冻土带) on the top of the mountain. It may seem that plants at a given altitude are associated in what can be called “communities” －groupings of species. The idea is that over time, plants that require particular climate and soil conditions come to live in the same places, and are frequently to be found together. Scientists study the history of plant life and build up a picture of how groups of plants have responded to climate changes and how ecosystems develop. But are these associations, which are real in the present, permanent?

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