A．Black-footed ferrets couldn't adjust to their new home.

　　B．The prairie dogs were hunted almost to disappearance.

　　C．The farmers destroyed most of the prairie dog towns.

　　D．The disease spread and poisoned the grassland.

　　62．When reintroducing the ferrets to the wild, the scientists faced the difficulty that _______.

　　A．there was not enough grassland to support the ferrets' population

　　B．local farmers disagreed to reintroduce the ferrets to the wild

　　C．the ferrets couldn't learn to avoid danger

　　D．young ferrets couldn't adapt to the wild

　　63．What is the best title of the passage?

　　A．Returning to the Wild World.

　　B．Rescuing Black-footed Ferrets.

　　C．Rebuilding Prairie Dog Towns.

　　D．Researching the Life of Ferrets.

　　C

　　MAP ARTIST PROGRAM

　　Map Artist is the perfect tool for creating customized （定制的） maps to include in research projects and reports. Map Artist offers endless possibilities. It has a huge collection of map styles to choose from, and they can be customized to suit your special needs. In this program, we will assume you have been asked to create a map for a social studies report.

　　Step1. When you open Map Artist, a world map will be displayed. Type “USA” in the dialogue box. Click GO. A map of USA will be displayed.

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