Thepassengerpigeon(旅鸽)usedtobeoneofthemostcommonbir...

问题详情：

     The passenger pigeon(旅鸽) used to be one of the most common birds on the earth. A century ago, they became extinct（灭绝）. Scientist Ben Novak is working to bring the birds back. Here, he explains to us why we should bring passenger pigeons back from extinct.

The passenger pigeon is not the bird that you probably know. It's been gone from the world for100 years. It means that few living people have ever seen one flying in the sky.

The passenger pigeon lived differently from other birds in America---in flocks(群) made up millions of birds. They darkened the sky when they flew in the air. One reason to bring passenger pigeons back to life is that it would be wonderful to see a flock that big. It would also be cool to see an extinct animal.

But it's not just about doing something cool. Huge flocks of passenger pigeons played a key role in shaping forests. The weight of so many birds resting in the trees broke many branches（树枝）. This allowed more sunlight to reach the forest floor, which helped more plants grow.

The birds also ate a large number of plants. That influenced which trees grew in the forest. If we bring back the passenger pigeon, it would play an important role in shaping forest once again.

1. Scientists Ben Novak is working to________.

   A . learn more about the forest.

   B. find more birds in the forest.

   C. bring back the passenger pigeon.

   D. Work out the number of pigeons.

2. When did passenger pigeon become extinct?

   A. 10 years ago.   B. 50 years ago.   C. 100 years ago.    D. 500 years ago.

3. How did the passenger pigeon live?

   A. In flocks.          B. In paris.

   C. By resting in dark forests.    D. By resting in cool places.

4. How did the passenger pigeon help forests?

   A. By helping more plants grow.

   B. By keeping many birds away.

   C. By staying on the forest floor.

   D. By preventing sunlight.

【回答】

1. C. 解析：细节题。由题干关键词Ben Novak is working to 定位到文章第一段Scientist Ben     Novak is working to bring the bird back. 所以*选C.

2. C. 解析：细节题。 由题干关键词 passenger pigeon become extinct 定位到文章第一段 A century ago, they became extinct（灭绝）. 所以*选C.

3. A. 解析：细节题。由题干关键词 how passenger pigeon live 定位到文章第三段The passenger pigeon lived differently from other birds in America---in flocks(群) made up millions of birds所以*选A.

4. A. 解析：细节题。由题干关键词 how passenger pigeon help forests 定位到文章第四段The weight of so many birds resting in the trees broke so many branches（树枝）. This allowed more sunlight to reach the forest floor, which helped more plants growing.

所以*选A.

知识点：科普环保类

题型：阅读理解