Lincoln Brower is a professor of biology at Sweet Briar College in Virginia. He has been studying monarch butterflies for fifty-two years. He says they have been migrating along the same path for about ten thousand years. People in Mexico have compared the arrival of the butterflies to dark cloud-like formations(阵式)filling the air. The monarchs arrive in such large numbers that they sometimes cover whole trees.

　　Mexico’s President ordered special protection for the Monarch Butterfly Biosphere Reserve eight years ago. The Mexican government has struggled to enforce(强制)the order. Although illegal logging has become one way for poor people to earn money, other Mexicans are fighting to protect the butterflies’home.

　　1. What would be the BEST title for the text?

　　A. Illegal Clearing of Forests Threatens Winter Home of Monarch Butterflies

　　B. The Forests are the Winter Home for Monarch Butterflies

　　C. Monarch Butterflies Like the Winter Home in the Forests

　　D. Protecting the Forests Can Protect Monarch Butterflies

　　2. Why are the forests called the winter home for millions of monarch butterflies? Because each winter the butterflies travel there to

　　.

　　A. avoid coldB. look for food

　　C. sleepD. produce young

　　3. Why did monarch butterflies choose the forest as their winter home?

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