《2025年实验班全程提优训练高中英语必修第二册人教版》

Ⅶ. (2024·吉林毓文中学期末)七选五
主题语境: 人与自然 语篇类型: 说明文 建议用时: 7
跨学科 For a bird to fly hundreds or thousands of miles each spring and fall is a difficult and dangerous journey, one that not all birds survive. 1 ______ There is more than one single reason for different birds to migrate (迁移), but it all comes down to survival.
Migrating for a Meal
For all birds, one of the main driving forces behind migration is food scarcity. If all birds were to stay in the south year - round, food would become scarce and breeding (繁殖) would be less successful. 2 ______ As the food supplies then decrease in the fall, they return to the south.
Migrating for Their Family
Over millions of years, birds have developed different migration patterns, timing and destinations to live around the world to breed. This helps birds take advantage of a wide variety of suitable conditions to raise their young. 3 ______
Migrating for Climate
4 ______ And changes in those climates can affect migration. Many birds leave the northern breeding grounds, for example, when temperatures begin to fall and they need warmer habitats. Similarly, the hottest southern places can be bad for raising fine chicks, and it is better to lay eggs further north in cooler areas.
Migrating for Predators (捕食者)
5 ______ Birds that migrate to different habitats can avoid being eaten by predators, giving their young a better chance of growing up. Many birds even migrate to certain habitats that are nearly impossible for predators to arrive, such as coastal cliffs or rocky offshore islands.
A. So why do birds migrate?
B. So how do little birds migrate?
C. This increases the survival chances of the chicks.
D. Birds have adapted themselves to global climate changes.
E. Birds have developed different types of feathers to survive different climates.
F. Habitats that have rich food sources year - round also attract a greater number of predators that can threaten nests.
G. But as food sources are rich in the north each spring, millions of birds migrate to those areas to take advantage of it.
1. ______ 2. ______ 3. ______ 4. ______ 5. ______

答案： Ⅶ. 语篇导读 本文是一篇说明文。文章分析了鸟类迁徙的原因。
1.A 本处需要一个主题句。本文主要分析了鸟类迁徙的原因，A项符合主题句的要求，且前后句一问一答，前后呼应，语意连贯。故选A。
2.G 后一句讲到秋天北方食物减少，鸟类飞回温暖的南方，故可判断前一句应讲鸟类北飞的情形。故选G。
3.C 鸟类迁徙的另一个原因是为了利用各种有利条件繁殖后代，延续家族，这些有利条件提高了小鸟的成活率。故选C。
4.E 根据小标题“Migrating for Climate”可知，本段主要讲鸟类因气候的原因迁徙，故E项最佳。选项中的climate是解题的关键。D项中虽然也出现了“climate”这个关键词，但是与小标题提示的主旨不相符，此处并不是说鸟类已经适应了全球气候变化。故选E。
5.F 本段主要讲鸟类因为避开肉食动物而迁徙，predators是一个重要的信息线索词。故选F。