Monarch butterflies(黑脉金斑蝶) are a common summer sight in the northern United States and Canada. These large orange and black insects brighten parks and gardens as they fly lightly among the flowers. What makes monarchs particularly interesting is that they migrate—all the way to California or Mexico and back. They are thought to be the only insect that does this. Every year in the late summer monarchs begin their journey to the south. Those heading for Mexico go first for the Louisiana-Mississippi area, then fly across the Gulf of Mexico into Texas. Once in Mexico, they settle themselves in one of about fifteen places in a mountain forests filled with fir tress. Each place provides a winter home for millions of monarchs. The butterflies are so many that they often cover entire trees. When spring comes, they begin their long journey north. The question is often asked whether every butterfly makes the round-trip journey every year. And the answer is no. The average monarch lives about nine months. So one flying north might lay eggs in Louisiana and then die. The eggs of that generation may be found in Kentucky; the eggs of the next generation may end up in Wisconsin or Michigan. The last generation of the season, about the fourth, will make their way back to Mexico and restart the journey. Scientist learn about monarchs’ migration by catching and making marks on the insects. By recatching a monarch with such a mark and noticing where it came from, the next scientist can get to know things like the butterfly’s age and its routing.【小题1】One of the places where monarchs spend the winter is ________. A．the Gulf of Mexico B．an area in Mississippi C．a forest in Mexico D．a plain in Texas 【小题2】The routing of monarchs’ migration can be learned ________. A．by examining the marks made on them B．by collecting their eggs in the mountains C．by comparing their eggs in their different ages D．by counting the dead ones in the forest 【小题3】What is the subject discussed in the passage? A．Migration of monarch. B．Scientists’ interest in monarchs. C．Winter home of monarchs. D．Life and death of monarchs.
Monarch butterflies(黑脉金斑蝶) are a common summer sight in the northern United States and Canada. These large orange and black insects brighten parks and gardens as they fly lightly among the flowers. What makes monarchs particularly interesting is that they migrate—all the way to California or Mexico and back. They are thought to be the only insect that does this.
Every year in the late summer monarchs begin their journey to the south. Those heading for Mexico go first for the Louisiana-Mississippi area, then fly across the Gulf of Mexico into Texas. Once in Mexico, they settle themselves in one of about fifteen places in a mountain forests filled with fir tress. Each place provides a winter home for millions of monarchs. The butterflies are so many that they often cover entire trees. When spring comes, they begin their long journey north.
The question is often asked whether every butterfly makes the round-trip journey every year. And the answer is no. The average monarch lives about nine months. So one flying north might lay eggs in Louisiana and then die. The eggs of that generation may be found in Kentucky; the eggs of the next generation may end up in Wisconsin or Michigan. The last generation of the season, about the fourth, will make their way back to Mexico and restart the journey.
Scientist learn about monarchs’ migration by catching and making marks on the insects. By recatching a monarch with such a mark and noticing where it came from, the next scientist can get to know things like the butterfly’s age and its routing.
【小题1】One of the places where monarchs spend the winter is ________.| A．the Gulf of Mexico | B．an area in Mississippi |
| C．a forest in Mexico | D．a plain in Texas |
| A．by examining the marks made on them | B．by collecting their eggs in the mountains |
| C．by comparing their eggs in their different ages | D．by counting the dead ones in the forest |
| A．Migration of monarch. | B．Scientists’ interest in monarchs. |
| C．Winter home of monarchs. | D．Life and death of monarchs. |
题目解答
答案
【小题1】C
【小题2】A
【小题3】A
解析
考查要点：本题主要考查学生对文章细节的理解、推理判断能力以及主旨大意的把握。
解题思路：
- 第1题需定位文章中描述黑脉金斑蝶冬季栖息地的句子，注意排除迁徙途经地的干扰选项。
- 第2题需结合科学家研究方法的关键句，明确“标记法”是核心手段。
- 第3题需通篇把握文章核心内容，聚焦“迁徙”这一贯穿全文的主题。
关键点：冬季栖息地位置、科学研究方法、文章主题定位。
第（1）题
关键句：Once in Mexico, they settle themselves in one of about fifteen places in a mountain forests filled with fir tress.
- 选项分析：
- A、B、D均为迁徙途中经过的区域（如墨西哥湾、密西西比州、得克萨斯州），而非冬季栖息地。
- C选项明确指出“墨西哥的山林”，与原文一致。
第（2）题
关键句：Scientist learn about monarchs’ migration by catching and making marks on the insects.
- 选项分析：
- A正确，科学家通过标记并重捕蝴蝶推断其迁徙路线。
- B、C、D均未提及，属于干扰项。
第（3）题
主旨判断：
- 文章围绕黑脉金斑蝶的迁徙行为展开，包括路线、时间、生命周期与迁徙的关系及研究方法。
- A选项“Migration of monarch”最能概括全文核心内容，其他选项均为局部细节。