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More than 5, 000 species of birds manage...

    More than 5, 000 species of birds manage annual round-trip migrations(迁徙). These journeys can be thousands of miles, with many birds often returning to the exact same nesting and wintering place from year to year.

Migration is very important in the life cycle of birds, and without this annual journey many birds would not be able to raise their young. Birds migrate to find the richest and most abundant food that will provide adequate energy to raise young birds. If no birds migrated, competition for adequate food during breeding(繁殖)seasons would be fierce and many birds would starve.

Of course, not all birds migrate. Some birds can take advantage of different food sources(来源)as seasons change, allowing them to stay in one place all year round. Other birds are better adapted to cold climates with thicker fat reserves and better feathers, and they can survive long cold seasons while they forage for winter food. For more than half the world's birds, however, migration is necessary to stay alive.

When the timing is right for their migrating needs, birds will begin their journey. Food, weather, temperature and illness or injury are several minor aspects that may affect migration by a day or two, but most bird species follow precise migration "schedule". While migration is at its finest during spring and fall, birds migrate all throughout the year. Migration is actually an ongoing process and there are always birds at some stage of their journeys. The distance the birds must fly, the length of time it takes to mate and the amount of young birds all affect when any one species is migrating.

Migratory birds have several changes before the journey. Among them is hyperphagia, the process of migration-related weight gain. As daylight changes and migration times near, a bird's hormone levels will change and they will build a greater fat supply. Besides, old, ragged feathers create more wind drag and air resistance, which requires a bird to use more energy in flight, so many birds replace old feathers with new ones.

1.Without migration, many birds would          .

A.stop reproducing during breeding seasons

B.abandon young birds for lack of food

C.be unable to find places for nesting

D.be in danger of starvation

2.What does the underlined phrase "forage for" mean in Paragraph 3?

A.Run out of. B.Cut down on.

C.Search for. D.Wait for.

3.What can we learn about birds' migration?

A.Most birds begin their journey at the arrival of spring.

B.Warm temperature usually advances it by a day or two.

C.There is almost little migration of birds in winter.

D.Birds' migration is affected by various aspects.

4.How will migratory birds benefit from the process of hyperphagia?

A.They will tend to use less energy in flight.

B.They will store enough energy for travelling.

C.They will replace old feathers with new ones.

D.They will better sense the changes of daylight.

 

1.D 2.C 3.D 4.B 【解析】 本文是一篇说明文,介绍了鸟类迁徙的相关知识,包括迁徙的原因以及影响迁徙的因素。 1.细节理解题。根据第二段Birds migrate to find the richest and most abundant food that will provide adequate energy to raise young birds. If no birds migrated. competition for adequate food during breeding(繁殖)seasons would be fierce and many birds would starve.“鸟类迁徙是为了寻找最丰富的食物,以提供足够的能量来喂养幼鸟。如果没有鸟类迁徙。在繁殖季节争夺足够的食物的竞争将是激烈的,许多鸟将会饿死。”可知,如果没有迁徙,鸟类就会因食物不足而挨饿。故选D。 2.词义猜测题。根据第三段Other birds are better adapted to cold climates with thicker fat reserves and better feathers, and they can survive long cold seasons... “其他鸟类更能适应寒冷的气候,有更厚的脂肪储备和更好的羽毛,它们能在漫长的寒冷季节生存下来。”可知,这些不迁徙的鸟类在冬天会寻找冬季食物。由此推知划线词的意思是“寻找”。故选C。 3.推理判断题。根据倒数第二段The distance the birds must fly, the length of time it takes to mate and the amount of young birds all affect when any one species is migrating.“鸟类必须飞行的距离、交配所需的时间以及幼鸟的数量都会影响到任何一个物种的迁徙。”由此判断出,鸟类的迁徙受到很多因素的影响。故选D。 4.细节理解题。根据最后一段Migratory birds have several changes before the journey. Among them is hyperphagia, the process of migration-related weight gain. As daylight changes and migration times near, a bird's hormone levels will change and they will build a greater fat supply.“候鸟在旅行前有几个变化。其中一种是食欲过盛,即与迁移有关的体重增加。随着日光的变化和迁徙时间的临近,鸟类的荷尔蒙水平会发生变化,它们会积累更多的脂肪。”可知,在迁徙前,他们将储存足够的能量以备迁徙之需。故选B。
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